--- freem/doc/freem.texi	2025/05/08 12:52:53	1.55
+++ freem/doc/freem.texi	2025/05/20 14:36:06	1.64
@@ -4,7 +4,7 @@
 @settitle The FreeM Manual
 
 @copying
-This manual is for FreeM, (version 0.65.0-rc0), which is a free software implementation of the M programming language.
+This manual is for FreeM, (version 0.65.1-rc1), which is a free software implementation of the M programming language.
 
 Print-optimized versions of this book are typeset in @emph{Computer Modern} by the author using the @emph{GNU Texinfo} tools.
 
@@ -19,7 +19,7 @@ Permission is granted to copy, distribut
 
 @title The FreeM Manual
 @subtitle @sc{The Official Manual of FreeM}
-@subtitle Version 0.65.0-rc0
+@subtitle Version 0.65.1-rc1
 @c@vskip 10pt
 @c@center @image{freem-logo-sm,,,,.png}
 @author Serena Willis
@@ -49,6 +49,7 @@ This is the official manual for the Free
 * The FreeM Environment Daemon::        Managing shared resources in the FreeM environment.
 * The FreeM Direct-Mode Environment::   Executing M programs interactively.
 * Debugging::                           The program development cycle of FreeM.
+* Program Development Cycle::           How to create, edit, test, and run FreeM programs.
 
 * Directives::                          Per-Routine Language Directives.
 * Intrinsic Special Variables::         Intrinsic Special Variables.
@@ -148,6 +149,7 @@ Current contributors denoted with a @emp
 @cindex contributors, Gerum, Winfried
 @cindex contributors, Kreis, Greg
 @cindex contributors, Landis, Larry
+@cindex contributors, McGlothlen, Ken
 @cindex contributors, Milligan, Lloyd
 @cindex contributors, Morris, Steve
 @cindex contributors, Murray, John
@@ -189,6 +191,9 @@ Larry Landis (Coordination, Code, Docume
 Rick Marshall (Testing, MDC Conformance) @emph{+}
 
 @item
+Ken McGlothlen (Apple Silicon build/test environment, proofreading of documentation) @emph{+}
+
+@item
 Lloyd Milligan (Code, Testing, Documentation)
 
 @item
@@ -425,7 +430,7 @@ If the daemon is started with @option{--
 
 The @option{--environment} option will start the daemon for the specified @emph{environment-name}. The default environment, if unspecified, is called @code{DEFAULT}. If using an environment other than @code{DEFAULT}, interpreter processes that wish to also connect to the same environment must also use the @option{--environment} option when starting, and @code{libfreem} clients must also pass the environment name as the first argument to the @code{freem_init()} function. Environments allow you to run multiple, isolated instances of FreeM on the same machine, whose globals and routines are distinct and unique.
 
-The @option{--shmsize} option specifies the size in bytes of the FreeM shared memory segment. The default is 4194304 bytes. Increasing the size of the FreeM shared memory segment will, at the cost of increased memory usage, increase the number of concurrent jobs and lock table entries available to the environment; decreasing the size of the segment will have the expected opposite effect. Note that you must also pass @option{--shmsize} with the same number of bytes to any interpreter process to be used with an environment whose daemon uses a non-default shared memory segment size.
+The @option{--shmsize} option specifies the size in bytes of the FreeM shared memory segment. The default is 16,777,216 bytes (16 megabytes). Increasing the size of the FreeM shared memory segment will, at the cost of increased memory usage, increase the number of concurrent jobs and lock table entries available to the environment; decreasing the size of the segment will have the expected opposite effect. Note that you must also pass @option{--shmsize} with the same number of bytes to any interpreter process to be used with an environment whose daemon uses a non-default shared memory segment size.
 
 Attempting to start a FreeM interpreter process without a daemon running with the same environment name will result in an error.
 
@@ -440,7 +445,7 @@ Attempting to start a FreeM interpreter
 The FreeM direct-mode environment is the mode entered when FreeM is invoked without the use of @option{-r @emph{<entryref>}} or @option{--routine=@emph{<entryref>}}:
 
 @example
-Coherent Logic Development FreeM version 0.65.0-rc0 (x86_64-pc-linux-gnu)
+Coherent Logic Development FreeM version 0.65.1-rc1 (x86_64-pc-linux-gnu)
 Copyright (C) 2014, 2020, 2021 Coherent Logic Development LLC
 
 
@@ -602,7 +607,7 @@ FreeM includes an interactive debugger,
 If you would like to enter the debugger automatically each time an error is encountered, add the following to your @code{LCLINIT} routine:
 
 @example
-S $ETR="B ""DEBUG"""
+S $ETRAP="B ""DEBUG"""
 @end example
 
 @section Debugging Commands
@@ -629,6 +634,12 @@ Halts the process being debugged and ret
 With no arguments, toggles watchpoints on and off. With @code{+}, adds @emph{<glvn>} to the watchlist. With @code{-}, removes @emph{<glvn>} from the watchlist. With @code{?}, queries the watch status of @emph{<glvn>}.
 @end table
 
+@node Program Development Cycle
+@chapter Program Development Cycle
+@cindex program development
+
+This chapter covers the essential activities of program development in the FreeM environment, including viewing, creating, editing, and running routines.
+
 @node Directives
 @chapter Directives
 @cindex directives
@@ -2095,6 +2106,7 @@ Identical to @ref{$TRANSLATE()}, except
 * ZASSERT::                             Raise error when a conditional expression evaluates @emph{false}.
 * ZBREAK::                              Enable/disable ZBREAK mode.
 * ZCONST::                              Define a constant that cannot be altered after initial definition.
+* ZEDIT::                               Edit a routine using an external editor.
 * ZGOTO::                               @code{GOTO} with @code{BREAK} control.
 * ZHALT::                               Exit FreeM job with return value.
 * ZINSERT::                             Insert code into routine buffer.
@@ -2648,7 +2660,7 @@ In the above @emph{inclusive} form, @cod
 @cartouche
 @quotation
 @emph{Note}
-The below @emph{argumentless} and @emph{exclusive} forms of @code{KSUBSCRIPTS} are not implemented in FreeM, as of version 0.65.0-rc0, but are planned for a future release.
+The below @emph{argumentless} and @emph{exclusive} forms of @code{KSUBSCRIPTS} are not implemented in FreeM, as of version 0.65.1-rc1, but are planned for a future release.
 @end quotation
 @end cartouche
 
@@ -2683,7 +2695,7 @@ In the above @emph{inclusive} form, @cod
 @cartouche
 @quotation
 @emph{Note}
-The below @emph{argumentless} and @emph{exclusive} forms of @code{KVALUE} are not implemented in FreeM, as of version 0.65.0-rc0, but are planned for a future release.
+The below @emph{argumentless} and @emph{exclusive} forms of @code{KVALUE} are not implemented in FreeM, as of version 0.65.1-rc1, but are planned for a future release.
 @end quotation
 @end cartouche
 
@@ -3438,6 +3450,39 @@ Constants must only be locals, and globa
 @code{ZCONST@emph{:postcondition} @emph{mref1}=@emph{initial-value1},...,@emph{mrefN}=@emph{initial-valueN}}
 @end example
 
+@node ZEDIT
+@section ZEDIT
+@cindex ZEDIT
+@cindex commands, ZEDIT
+@cindex commands, non-standard
+@emph{FreeM Extension}
+
+Edits a routine using an external editor. Uses environment variable @code{$EDITOR} if defined; otherwise, uses @code{vi}.
+
+@emph{Syntax}
+
+@example
+ZEDIT@emph{[:postcondition]}
+@end example
+
+In its argumentless form, edits the currently-active routine, provided the optional @emph{postcondition} is @emph{true} or omitted.
+
+@emph{Syntax}
+
+@example
+ZEDIT@emph{[:postcondition]} @emph{<routine-name>}
+@end example
+
+In its single-argument form, edits @emph{<routine-name>}, provided the optional @emph{postcondition} is @emph{true} or omitted.
+
+If the specified routine does not exist, it will be created.
+
+Routine names must not be quoted, and must not included a leading caret (@code{^}).
+
+@emph{Errors}
+
+@code{ZEDIT} will raise @code{ZNOPGM} in its argumentless form if there is no routine currently loaded.
+
 @node ZGOTO
 @section ZGOTO
 @cindex ZGOTO
@@ -3446,7 +3491,7 @@ Constants must only be locals, and globa
 @cindex commands, non-standard
 @emph{FreeM Extension}
 
-In its argumented form, enables @code{BREAK} mode and branches unconditionally to @emph{entryref}.
+In its single-argument form, enables @code{BREAK} mode and branches unconditionally to @emph{entryref}.
 
 @emph{Syntax}
 
@@ -3454,7 +3499,7 @@ In its argumented form, enables @code{BR
 ZGOTO @emph{entryref}
 @end example
 
-In its argumented form, resumes execution after a @code{BREAK}.
+In its argumentless form, resumes execution after a @code{BREAK}.
 
 @emph{Syntax}
 
@@ -3494,6 +3539,16 @@ ZHALT
 @cindex commands, non-standard
 @emph{FreeM Extension}
 
+Inserts a line of M code into the currently-active routine buffer, provided the optional @emph{postcondition} is @emph{true} or omitted.
+
+@emph{Syntax}
+
+@example
+ZINSERT@emph{:postcondition} @emph{expr V mcode}[:@emph{label}]
+@end example
+
+Above, @emph{expr V mcode} is an expression returning a string giving M code. If @emph{label} is omitted, the code will be inserted at the insertion point, which is typically the end of the routine. Otherwise, the code will be inserted at the line immediately following @emph{label}.
+
 @node ZJOB
 @section ZJOB
 @cindex ZJOB
@@ -3554,7 +3609,7 @@ ZMAP[@emph{:postcondition}] GLOBAL @emph
 @cindex commands, non-standard
 @emph{FreeM Extension}
 
-Prints the contents of the current routine buffer, provided the optional @emph{postcondition} is @emph{true} or omitted.
+In argumentless form, prints the contents of the current routine buffer, provided the optional @emph{postcondition} is @emph{true} or omitted.
 
 @emph{Syntax}
 
@@ -3562,6 +3617,16 @@ Prints the contents of the current routi
 ZPRINT@emph{:postcondition}
 @end example
 
+In argumented form, prints a subset of the current routine buffer, provided the optional @emph{postcondition} is @emph{true} or omitted.
+
+@emph{Syntax}
+
+@example
+ZPRINT@emph{:postcondition} @emph{start}[:@emph{end}]
+@end example
+
+In the above syntax, @emph{start} and @emph{end} can be a tag in the current routine, or @code{*} to indicate the routine buffer insertion point (typically the end of the routine).
+
 @node ZQUIT
 @section ZQUIT
 @cindex ZQUIT
@@ -3588,6 +3653,24 @@ In its argumentless form, quits from @co
 @cindex commands, non-standard
 @emph{FreeM Extension}
 
+In argumentless form, removes all M code from the current routine buffer, provided the optional @emph{postcondition} is @emph{true} or omitted.
+
+@emph{Syntax}
+
+@example
+ZREMOVE@emph{:postcondition}
+@end example
+
+In argumented form, removes a subset of the current routine buffer, provided the optional @emph{postcondition} is @emph{true} or omitted.
+
+@emph{Syntax}
+
+@example
+ZREMOVE@emph{:postcondition} @emph{start}[:@emph{end}]
+@end example
+
+In the above syntax, @emph{start} and @emph{end} can be a tag in the current routine, or @code{*} to indicate the routine buffer insertion point (typically the end of the routine).
+
 @node ZSAVE
 @section ZSAVE
 @cindex ZSAVE
@@ -4022,11 +4105,61 @@ The following subscripts are supported:
 
 @table @asis
 
+@item @code{$IO} +R -U -D
+Returns the current value of @code{$IO} for the job.
+
+@item @code{$PDISPLAY} +R -U -D
+Returns the value of @code{$PDISPLAY} for the job.
+
+@item @code{$PRINCIPAL} +R -U -D
+Returns the value of @code{$PRINCIPAL} for the job.
+
+@item @code{$TLEVEL} +R -U -D
+Returns the current transaction level (value of @code{$TLEVEL} for the job.
+
+@item @code{BREAK_HANDLER} +R +U -D
+Contains M code to be executed when the @code{BREAK} command is run.
+
+@item @code{CHARACTER} +R -U -D
+Returns the character set of the job.
+
+@item @code{CWD} +R +U -D
+Returns or sets the current working directory of the job.
+
+@item @code{EVENT} +R +U +D
+The subtree contained under @code{^$JOB($J,"EVENT")} defines asynchronous event handlers for the current job. Please see @emph{Asynchronous Event Handling} for more information.
+
+@item @code{GLOBAL} +R -U -D
+Returns the global environment of the job.
+
+@item @code{GROUP} +R -U -D
+Returns the GID of the group owning the job.
+
 @item @code{GVNDEFAULT} +R +U +D
 Contains a default expression to be evaluated if a global variable access attempt results in an @code{M7} error.
 
 Equivalent to wrapping all global accesses in @code{$GET(@emph{global-name},@emph{string-expr})}.
 
+@item @code{GVNQOVAL} +R +U +D
+Contains the data value (if any) at the subscripted global variable reference from the most recent @code{$ORDER} or @code{$QUERY} operation.
+
+This node is useful for code that uses @code{$ORDER} or @code{$QUERY} heavily in loops that retrieve successive data values, as it will prevent an additional data file scan that would result from retrieving the data value in the usual way, thus improving application performance. However, this optimization comes at the cost of compatibility with other M implementations.
+
+@item @code{GVN_CASE_SENSITIVE} +R +U -D
+Returns or sets the case sensitivity of global names. If set to @code{0}, global names are case-insensitive. If set to @code{1}, global names are case-sensitive.
+
+@item @code{GVN_NAME_SUB_LENGTH} +R +U -D
+Returns or sets the maximum number of characters of a global name plus all of its subscripts, from 1-255.
+
+@item @code{GVN_SUB_LENGTH} +R +U -D
+Returns or sets the maximum number of characters of a single global subscript, from 1-255.
+
+@item @code{GVN_UNIQUE_CHARS} +R +U -D
+Returns or sets the number of characters of a global name that make it unique, from 1 to 255.
+
+@item @code{IOPATH} +R +U -D
+Returns or sets the @emph{I/O path} to be used by the @code{OPEN} command.
+
 @item @code{LVNDEFAULT} +R +U +D
 Contains a default expression to be evaluated if a local variable access attempt results in an @code{M6} error.
 
@@ -4037,150 +4170,111 @@ Contains the data value (if any) at the
 
 This node is useful for code that uses @code{$ORDER} or @code{$QUERY} heavily in loops that retrieve successive data values, as it will prevent an additional symbol table scan that would result from retrieving the data value in the usual way, thus improving application performance. However, this optimization comes at the cost of compatibility with other M implementations.
 
-@item @code{GVNQOVAL} +R +U +D
-Contains the data value (if any) at the subscripted global variable reference from the most recent @code{$ORDER} or @code{$QUERY} operation.
+@item @code{MATH} +R +U -D
+Returns or sets the mode in which decimal comparisons and arithmetic calculations are conducted. Valid values are @code{FIXED}, for fixed-point decimals having up to 20,000 digits of precision, as determined by the @code{$ZPRECISION} intrinsic special variable, and @code{IEEE754}, to use IEEE 754 floating-point decimals. When in @code{IEEE754} mode, floating-point numbers support up to 16 digits of numeric precision.
 
-This node is useful for code that uses @code{$ORDER} or @code{$QUERY} heavily in loops that retrieve successive data values, as it will prevent an additional data file scan that would result from retrieving the data value in the usual way, thus improving application performance. However, this optimization comes at the cost of compatibility with other M implementations.
+@code{IEEE754} mode will make mathematical calculations significantly faster, especially when accelerated by a floating-point processor, at the expense of precision and accuracy.
 
-@item @code{ZCOMMANDS} +R +U -D
-Contains a space-delimited list of @code{Z}-commands to be treated as intrinsic. Any @code{Z}-command not appearing in this list will be treated as a user-defined command.
+@code{FIXED} mode is recommended for financial calculations, or where precision and accuracy are valued over performance. @code{FIXED} is the default mode of FreeM operation.
 
-For instance, if command @code{ZFOO} does @emph{not} appear in this list, FreeM will attempt to run @code{^%ZFOO} as a subroutine when the @code{ZFOO} command is encountered in program code.
+Attempting to @code{SET} this node to values other than @code{FIXED} or @code{IEEE754} will set @code{$ECODE} to @code{M29}.
 
-If you remove a command from this list, you may provide your own private M implementation of the command in the manner described above.
+@item @code{NAMESPACE} +R +U -D
+Returns or sets the name of the job's currently-active namespace.
 
-If an argument is passed to a @code{Z}-command you implement in M, it is made available to your M code in a variable whose name is specified in @code{^$JOB($JOB,"ZCOMMAND_ARGUMENT_NAME")}, which defaults to @code{%}.
+@item @code{OPEN} +R -U -D
+The @code{^$JOB($JOB,"OPEN",<channel>} subscripts list the open I/O channels in the specified job.
 
 @item @code{PIPE_GLVN} +R +U -D
 Contains an M local or global variable to be used as standard input or standard output for the external shell commands run by @code{!<} and @code{!>}.
 
-@item @code{ZCOMMAND_ARGUMENT_NAME} +R +U -D
-Returns or sets the variable name in which arguments to user-defined @code{Z}-commands are passed. Defaults to @code{%}.
-
-@item @code{ZFUNCTIONS} +R +U -D
-Contains a space-delimited list of @code{Z} functions to be treated as intrinsic. Any @code{Z} function not appearing in this list will be treated as a user-defined extrinsic function.
-
-For instance, if function @code{$ZFOO} does @emph{not} appear in this list, FreeM will attempt to return the value of @code{$$^%ZFOO} called as an extrinsic function.
-
-If you remove a function from this list, you may provide your own private M implementation of the function in the manner described above.
-
-@item @code{ZSVS} +R +U -D
-Contains a space-delimited list of @code{Z} special variables to be treated as intrinsic. Any @code{Z} special variable  not appearing in this list will be treated as a user-defined extrinsic function taking no arguments.
+@item @code{PRIORITY} +R +U -D
+Returns or sets the @emph{nice} value of the FreeM job.
 
-For instance, if the special variable @code{$ZFOO} does @emph{not} appear in this list, FreeM will attempt to return the value of @code{$$^%ZFOO} called as an extrinsic function.
+@item @code{REVSTR} +R +U -D
+When set to 1, allows @code{$EXTRACT} to accept negative values.
 
-If you remove a built-in special variable from this list, you may provide your own private M implementation of the special variable in the manner described above.
+@item @code{ROUTINE} +R -U -D
+Returns the name of the routine currently being executed by the job.
 
-@item @code{BREAK_HANDLER} +R +U -D
-Contains M code to be executed when the @code{BREAK} command is run.
+@item @code{ROUTINE_BUFFER_AUTO_ADJUST} +R +U -D
+Determines whether or not the size of routine buffers will be automatically adjusted at runtime. If set to @code{0}, routine buffers will be fixed to the byte size specified in @code{ROUTINE_BUFFER_SIZE} and may be manually resized using @code{ROUTINE_BUFFER_SIZE}. If set to @code{1}, routine buffers will grow automatically as necessary.
+@item @code{ROUTINE_BUFFER_COUNT} +R +U -D
+Returns or sets the number of routine buffers that FreeM will store in memory concurrently. Raising this value will increase memory usage, but will also increase performance if your applications call many different routines repeatedly.
 
 @item @code{ROUTINE_BUFFER_SIZE} +R +U -D
 Returns or sets the number of bytes allocated to each routine buffer. If @code{ROUTINE_BUFFER_AUTO_ADJUST} is set to @code{0}, this determines the maximum size of routines that FreeM will execute.
 
-@item @code{ROUTINE_BUFFER_COUNT} +R +U -D
-Returns or sets the number of routine buffers that FreeM will store in memory concurrently. Raising this value will increase memory usage, but will also increase performance if your applications call many different routines repeatedly.
-
-@item @code{ROUTINE_BUFFER_AUTO_ADJUST} +R +U -D
-Determines whether or not the size of routine buffers will be automatically adjusted at runtime. If set to @code{0}, routine buffers will be fixed to the byte size specified in @code{ROUTINE_BUFFER_SIZE} and may be manually resized using @code{ROUTINE_BUFFER_SIZE}. If set to @code{1}, routine buffers will grow automatically as necessary.
+@item @code{SINGLE_USER} +R +U -D
+If set to @code{1}, FreeM will skip all file locking operations on globals. If set to @code{0}, FreeM will enforce file locking on both.
 
-@item @code{SYMBOL_TABLE_SIZE} +R +U -D
-Returns or sets the number of bytes allocated to each of the two FreeM symbol tables. If @code{SYMBOL_TABLE_AUTO_ADJUST} is @code{1}, this value is treated as a default, initial size. If @code{SYMBOL_TABLE_AUTO_ADJUST} is @code{0}, this value controls the fixed size of the two symbol tables.
+Setting @code{SINGLE_USER} to @code{1} will improve FreeM performance, but you must @emph{ONLY} use this on systems where you are absolutely sure that only one FreeM process will run at any given time, as running multiple instances of FreeM concurrently when any of them are set to @code{SINGLE_USER} mode @emph{will} cause global data corruption.
 
 @item @code{SYMBOL_TABLE_AUTO_ADJUST} +R +U -D
 Determines whether or not the size of the two FreeM symbol tables will be automatically adjusted at runtime. If set to @code{0}, the symbol table will be fixed to the byte size specified in @code{SYMBOL_TABLE_SIZE} and may be manually resized by modifying @code{SYMBOL_TABLE_SIZE}. If set to @code{1}, the two symbol tables will grow automatically as necessary.
 
+@item @code{SYMBOL_TABLE_SIZE} +R +U -D
+Returns or sets the number of bytes allocated to each of the two FreeM symbol tables. If @code{SYMBOL_TABLE_AUTO_ADJUST} is @code{1}, this value is treated as a default, initial size. If @code{SYMBOL_TABLE_AUTO_ADJUST} is @code{0}, this value controls the fixed size of the two symbol tables.
 
-@item @code{USER_DEFINED_ISV_TABLE_SIZE} +R +U -D
-Returns or sets the number of bytes allocated to the FreeM user-defined intrinsic special variable table. If @code{USER_DEFINED_ISV_TABLE_AUTO_ADJUST} is @code{1}, this value is treated as a default, initial size. If @code{USER_DEFINED_ISV_TABLE_AUTO_ADJUST} is @code{0}, this value controls the fixed byte size of the user-defined intrinsic special variable table.
+@item @code{USER} +R -U -D
+Returns the UID of the user owning the job.
 
 @item @code{USER_DEFINED_ISV_TABLE_AUTO_ADJUST} +R +U -D
 Determines whether or not the size of the FreeM user-defined intrinsic special variable table will be automatically adjusted at runtime. If set to @code{0}, the user-defined ISV table will be fixed to the byte size specified in @code{USER_DEFINED_ISV_TABLE_SIZE} and may be manually resized by modifying @code{USER_DEFINED_ISV_TABLE_SIZE}. If set to @code{1}, the user-defined ISV table will grow automatically as necessary.
 
-@item @code{GVN_UNIQUE_CHARS} +R +U -D
-Returns or sets the number of characters of a global name that make it unique, from 1 to 255.
-
-@item @code{GVN_CASE_SENSITIVE} +R +U -D
-Returns or sets the case sensitivity of global names. If set to @code{0}, global names are case-insensitive. If set to @code{1}, global names are case-sensitive.
-
-@item @code{GVN_NAME_SUB_LENGTH} +R +U -D
-Returns or sets the maximum number of characters of a global name plus all of its subscripts, from 1-255.
-
-@item @code{GVN_SUB_LENGTH} +R +U -D
-Returns or sets the maximum number of characters of a single global subscript, from 1-255.
-
-@item @code{SINGLE_USER} +R +U -D
-If set to @code{1}, FreeM will skip all file locking operations on globals. If set to @code{0}, FreeM will enforce file locking on both.
+@item @code{USER_DEFINED_ISV_TABLE_SIZE} +R +U -D
+Returns or sets the number of bytes allocated to the FreeM user-defined intrinsic special variable table. If @code{USER_DEFINED_ISV_TABLE_AUTO_ADJUST} is @code{1}, this value is treated as a default, initial size. If @code{USER_DEFINED_ISV_TABLE_AUTO_ADJUST} is @code{0}, this value controls the fixed byte size of the user-defined intrinsic special variable table.
 
-Setting @code{SINGLE_USER} to @code{1} will improve FreeM performance, but you must @emph{ONLY} use this on systems where you are absolutely sure that only one FreeM process will run at any given time, as running multiple instances of FreeM concurrently when any of them are set to @code{SINGLE_USER} mode @emph{will} cause global data corruption.
+@item @code{USER_ERRORS} +R +U +D
 
-@item @code{CHARACTER} +R -U -D
-Returns the character set of the job.
-
-@item @code{CWD} +R +U -D
-Returns or sets the current working directory of the job.
+Custom error messages for @code{ZUSERERR} may be set in @code{^$JOB($JOB,"USER_ERRORS",<user_error_code>)}, where @code{<user_error_code>} represents the custom error code.
 
-@item @code{OPEN} +R -U -D
-The @code{^$JOB($JOB,"OPEN",<channel>} subscripts list the open I/O channels in the specified job.
+For example:
 
-@item @code{BERKELEYDB,FLUSH_THRESHOLD} +R +U -D
-Returns or sets the number of write operations that will be cached in the BerkeleyDB global handler prior to flushing BerkeleyDB's cache to disk.
+@example
+DEFAULT.USER> S ^$JOB($JOB,"USER_ERRORS","UBLACKHOLE")="black hole encountered"
 
-@item @code{EVENT} +R +U +D
-The subtree contained under @code{^$JOB($J,"EVENT")} defines asynchronous event handlers for the current job. Please see @emph{Asynchronous Event Handling} for more information.
 
-@item @code{GLOBAL} +R -U -D
-Returns the global environment of the job.
+DEFAULT.USER> ZTHROW UBLACKHOLE
 
-@item @code{IOPATH} +R +U -D
-Returns or sets the @emph{I/O path} to be used by the @code{OPEN} command.
 
-@item @code{PRIORITY} +R +U -D
-Returns or sets the @emph{nice} value of the FreeM job.
+>> Error UBLACKHOLE:  black hole encountered in SYSTEM::^%SYSINIT  [$STACK = 0]
+>> ZTHROW UBLACKHOLE
+                  ^
+@end example
 
-@item @code{REVSTR} +R +U -D
-When set to 1, allows @code{$EXTRACT} to accept negative values.
+Note that the error code must begin with @code{U}.
 
-@item @code{ROUTINE} +R -U -D
-Returns the name of the routine currently being executed by the job.
+@item @code{ZCOMMANDS} +R +U -D
+Contains a space-delimited list of @code{Z}-commands to be treated as intrinsic. Any @code{Z}-command not appearing in this list will be treated as a user-defined command.
 
-@item @code{SYMTAB} +R +U -D
-Returns or sets the current local variable symbol table in use.
+For instance, if command @code{ZFOO} does @emph{not} appear in this list, FreeM will attempt to run @code{^%ZFOO} as a subroutine when the @code{ZFOO} command is encountered in program code.
 
-FreeM supports two unique and independent symbol tables, allowing FreeM programs to maintain two independent sets of identically- or differently-named local variables per process.
+If you remove a command from this list, you may provide your own private M implementation of the command in the manner described above.
 
-The default symbol table is @code{0}, and the alternate symbol table is @code{1}, corresponding to the valid values for @code{^$JOB($JOB,"SYMTAB")}.
+If an argument is passed to a @code{Z}-command you implement in M, it is made available to your M code in a variable whose name is specified in @code{^$JOB($JOB,"ZCOMMAND_ARGUMENT_NAME")}, which defaults to @code{%}.
 
-Setting this subscript to values other than @code{0} or @code{1} will result in a @code{ZINVEXPR} error.
+@item @code{ZCOMMAND_ARGUMENT_NAME} +R +U -D
+Returns or sets the variable name in which arguments to user-defined @code{Z}-commands are passed. Defaults to @code{%}.
 
-@item @code{$PDISPLAY} +R -U -D
-Returns the value of @code{$PDISPLAY} for the job.
+@item @code{ZFUNCTIONS} +R +U -D
+Contains a space-delimited list of @code{Z} functions to be treated as intrinsic. Any @code{Z} function not appearing in this list will be treated as a user-defined extrinsic function.
 
-@item @code{$PRINCIPAL} +R -U -D
-Returns the value of @code{$PRINCIPAL} for the job.
+For instance, if function @code{$ZFOO} does @emph{not} appear in this list, FreeM will attempt to return the value of @code{$$^%ZFOO} called as an extrinsic function.
 
-@item @code{$TLEVEL} +R -U -D
-Returns the current transaction level (value of @code{$TLEVEL} for the job.
+If you remove a function from this list, you may provide your own private M implementation of the function in the manner described above.
 
-@item @code{$IO} +R -U -D
-Returns the current value of @code{$IO} for the job.
+@item @code{ZSVS} +R +U -D
+Contains a space-delimited list of @code{Z} special variables to be treated as intrinsic. Any @code{Z} special variable  not appearing in this list will be treated as a user-defined extrinsic function taking no arguments.
 
-@item @code{USER} +R -U -D
-Returns the UID of the user owning the job.
+For instance, if the special variable @code{$ZFOO} does @emph{not} appear in this list, FreeM will attempt to return the value of @code{$$^%ZFOO} called as an extrinsic function.
 
-@item @code{GROUP} +R -U -D
-Returns the GID of the group owning the job.
+If you remove a built-in special variable from this list, you may provide your own private M implementation of the special variable in the manner described above.
 
-@item @code{NAMESPACE} +R +U -D
-Returns or sets the name of the job's currently-active namespace.
 
-@item @code{MATH} +R +U -D
-Returns or sets the mode in which decimal comparisons and arithmetic calculations are conducted. Valid values are @code{FIXED}, for fixed-point decimals having up to 20,000 digits of precision, as determined by the @code{$ZPRECISION} intrinsic special variable, and @code{IEEE754}, to use IEEE 754 floating-point decimals. When in @code{IEEE754} mode, floating-point numbers support up to 16 digits of numeric precision.
 
-@code{IEEE754} mode will make mathematical calculations significantly faster, especially when accelerated by a floating-point processor, at the expense of precision and accuracy.
 
-@code{FIXED} mode is recommended for financial calculations, or where precision and accuracy are valued over performance. @code{FIXED} is the default mode of FreeM operation.
 
-Attempting to @code{SET} this node to values other than @code{FIXED} or @code{IEEE754} will set @code{$ECODE} to @code{M29}.
 
 @end table
 
@@ -5777,7 +5871,7 @@ Raised when attempts are made to set @co
 Raised when an @code{ZASSERT} expression's result is not true.
 
 @item @code{ZUSERERR} - @emph{user-defined error}
-Raised when program code calls @code{THROW} with an error code argument for which the first character is @code{U}, or when @code{$ECODE} is set to an error code for which the first character is @code{U}.
+Raised when program code calls @code{ZTHROW} with an error code argument for which the first character is @code{U}, or when @code{$ECODE} is set to an error code for which the first character is @code{U}.
 
 Custom error messages for @code{ZUSERERR} may be set in @code{^$JOB($JOB,"USER_ERRORS",<user_error_code>)}, where @code{<user_error_code>} represents the custom error code.
 
@@ -5787,11 +5881,11 @@ For example:
 DEFAULT.USER> S ^$JOB($JOB,"USER_ERRORS","UBLACKHOLE")="black hole encountered"
 
 
-DEFAULT.USER> THROW UBLACKHOLE
+DEFAULT.USER> ZTHROW UBLACKHOLE
 
 
 >> Error UBLACKHOLE:  black hole encountered in SYSTEM::^%SYSINIT  [$STACK = 0]
->> THROW UBLACKHOLE
+>> ZTHROW UBLACKHOLE
                   ^
 @end example
 
@@ -5972,14 +6066,14 @@ Raised when an attempt is made to use a
 FreeM allows the following installation methods:
 @table @asis
 @item Binary Repository
-On recent versions the Ubuntu and Debian distributions of GNU/Linux, we provide package repositories from which FreeM may easily be installed. See the @emph{FreeM Wiki} for more information, and @emph{https://packages.coherent-logic.com} for instructions.
+For recent versions of the Ubuntu and Debian distributions of GNU/Linux, we provide package repositories from which FreeM may easily be installed. See the @emph{FreeM Wiki} for more information, and @emph{https://packages.coherent-logic.com} for instructions.
 
 If available, this is the simplest method of installing FreeM.
 @item Binary Packages
 We provide binary packages of FreeM for @emph{dpkg} and @emph{rpm}-based distributions of GNU/Linux, and @emph{pkgadd} packages for Solaris 8-10. If you cannot use repositories, this is the easiest option.
 
 See @emph{https://freem.coherent-logic.com/binaries.cfm} for downloads and instructions.
-@item Source Archive
+@item Source Tarball
 If you prefer installing from source, we recommend that you download the latest @emph{.tar.gz} file from @emph{https://freem.coherent-logic.com/downloads.cfm}, and follow these steps:
 
 @example
@@ -6031,6 +6125,20 @@ $ ./configure --enable-mwapi
 $ make
 $ sudo make install
 @end example
+
+@item @code{--enable-newglobals} (EXPERIMENTAL)
+Enables a new and modernized global handler. This global handler has a number of known bugs, and thus should be used with caution.
+
+Note that global files created in the default global handler are incompatible with the new global handler, and vice-versa. You will need to back up and remove all globals in your environments when switching global handlers.
+
+
+@emph{Example}
+
+@example
+$ ./configure --enable-newglobals
+$ make
+$ sudo make install
+@end example
 
 @end table