Trace procedures

_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.