When I'm debugging and I can't get to the System Menu, how can I set a break?
You can directly request a break to the debugger by typing Ctl-Break. The break will occur as soon as the current ACCEPT statement terminates. If the program is not currently processing an ACCEPT statement, the break will occur after the current statement terminates. This provides a method of dynamically breaking to the debugger when you cannot get to the system menu (for example, when you are in a floating window).