--- freem/doc/freem.texi	2025/05/05 12:55:17	1.47
+++ freem/doc/freem.texi	2025/05/05 14:26:59	1.51
@@ -1713,6 +1713,8 @@ Returns the Levenshtein distance between
 @cindex intrinsic functions, $ZM
 @cindex intrinsic functions, implementation-specific
 
+Purpose unknown.
+
 @node $ZNAME()
 @section $ZNAME
 @cindex $ZNAME
@@ -2045,21 +2047,21 @@ Identical to @ref{$TRANSLATE()}, except
 * WRITE::                               Write output to current input/output device.
 * XECUTE::                              Interpret string as M code.
 * ZASSERT::                             Raise error when a conditional expression evaluates @emph{false}.
-* ZBREAK::                              Unknown.
+* ZBREAK::                              Enable/disable ZBREAK mode.
 * ZCONST::                              Define a constant that cannot be altered after initial definition.
-* ZGO::                                 Unknown.
-* ZHALT::                               Unknown.
+* ZGOTO::                               @code{GOTO} with @code{BREAK} control.
+* ZHALT::                               Exit FreeM job with return value.
 * ZINSERT::                             Insert code into routine buffer.
-* ZJOB::                                Invokes a job, ignoring any timeouts.
+* ZJOB::                                Invoke job, ignoring any timeouts.
 * ZLOAD::                               Load routine into routine buffer.
 * ZMAP::                                Map a global name to a non-default namespace.
 * ZNEW::                                Unknown.
 * ZPRINT::                              Print contents of routine buffer.
-* ZQUIT::                               Quits multiple stack levels at once.
+* ZQUIT::                               Quit multiple stack levels at once.
 * ZREMOVE::                             Remove code from routine buffer.
 * ZSAVE::                               Save routine buffer to disk.
 * ZTHROW::                              Programmatically raise an error condition.
-* ZTRAP::                               Unknown.
+* ZTRAP::                               Raise a FreeM error.
 * ZUNMAP::                              Remove a mapping of a global to a non-default namespace.
 * ZWATCH::                              Enable or disable watchpoints, or set or clear watchpoints on specified globals, locals, or structured system variables.
 * ZWITH::                               Set prefix for future variable references.
@@ -3365,6 +3367,14 @@ DEFAULT.USER> ZASSERT:DEBUG 1=0
 @cindex commands, non-standard
 @emph{FreeM Extension}
 
+Sets or clears the @code{ZBREAK} flag@footnote{NOTE: FreeM team needs to investigate how @code{zbreakon} and @code{zbflag} affect program execution.}, based on the result of evaluating @emph{tvexpr}.
+
+@emph{Syntax}
+
+@example
+ZBREAK @emph{tvexpr}
+@end example
+
 @node ZCONST
 @section ZCONST
 @cindex ZCONST
@@ -3382,14 +3392,30 @@ Constants must only be locals, and globa
 @code{ZCONST@emph{:postcondition} @emph{mref1}=@emph{initial-value1},...,@emph{mrefN}=@emph{initial-valueN}}
 @end example
 
-@node ZGO
-@section ZGO
-@cindex ZGO
-@cindex commands, ZGO
+@node ZGOTO
+@section ZGOTO
+@cindex ZGOTO
+@cindex commands, ZGOTO
 @cindex commands, implementation-specific
 @cindex commands, non-standard
 @emph{FreeM Extension}
 
+In its argumented form, enables @code{BREAK} mode and branches unconditionally to @emph{entryref}.
+
+@emph{Syntax}
+
+@example
+ZGOTO @emph{entryref}
+@end example
+
+In its argumented form, resumes execution after a @code{BREAK}.
+
+@emph{Syntax}
+
+@example
+ZGOTO
+@end example
+
 @node ZHALT
 @section ZHALT
 @cindex ZHALT
@@ -3398,6 +3424,22 @@ Constants must only be locals, and globa
 @cindex commands, non-standard
 @emph{FreeM Extension}
 
+In its single-argumented form, @code{ZHALT} command is used to exit the FreeM process with a specific return value @emph{intexpr}.
+
+@emph{Syntax}
+
+@example
+ZHALT @emph{intexpr}
+@end example
+
+In its argumentless form, @code{ZHALT} is synonymous with @code{HALT}.
+
+@emph{Syntax}
+
+@example
+ZHALT
+@end example
+
 @node ZINSERT
 @section ZINSERT
 @cindex ZINSERT
@@ -3539,6 +3581,8 @@ Raises an error condition as long as the
 @cindex commands, non-standard
 @emph{FreeM Extension}
 
+Synonymous with @ref{ZTHROW}.
+
 @node ZUNMAP
 @section ZUNMAP
 @cindex ZUNMAP