Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

:nTrace On Command (Full Menus Only)
Turn this toggle on when you want QuickBASIC to
  ■ Run your program in slow motion, highlighting each
    statement as it executes
  ■ Record the last 20 lines of program code executed
    before a program stops
 
This lets you observe the general flow of your program.
Use with watchpoints, breakpoints, or CTRL+BREAK to
suspend program execution periodically.
 
Then use SHIFT+F8 and SHIFT+F10 to single-step backward
and forward through the last 20 lines of code.