_stop
makes a pause. The "Resume/stop" window is displayed.
_print
displays the work string in the "Trace" window.
_printOn
and
_printOff
set the "Display computation" mode on and off respectively. Similarly,
_traceOn
and
_traceOff
set the "Trace computation" mode on and off respectively, while
_stepOn
and
_stepOff
do the same with the "Step computation" mode.