You can use the assign function to create a macro that lasts only until the end of the current session. For example, the following steps create the comment macro described above:
Press ALT+A
Type comment:=begline "; "
Press ALT+=
This key sequence tells PWB to open dialog boxes where the macro and key assignments are to be typed. To assign ALT+C to the macro,
Press ALT+A
Type comment:alt+c
Press ALT+=
The macro is available immediately and is discarded when you exit PWB.