Stop a Lisp Monitor.
stop-gc-monitor stops the Lisp Monitor window on the screen
t if it stopped a Lisp monitor, and
nil if there was no Lisp monitor running on
Note that this works only on Motif. The Lisp monitor can be restarted with start-gc-monitor.
CAPI User Guide and Reference Manual (Macintosh version) - 25 Feb 2015