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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

Use the Toggle Breakpoint command to turn breakpoints
(places you want your program to stop running) on and off:
  1. Move the cursor to the line you want the breakpoint on.
  2. Choose Toggle Breakpoint (or press F9).
The QBX environment highlights the breakpoint line.
 
To turn off a breakpoint:
  1. Move the cursor to a highlighted breakpoint line.
  2. Choose Toggle Breakpoint.
 
Use a breakpoint to pause your program at a point where
you suspect problems, then:
  ■ Test the values of variables in the Immediate window
    or with Instant Watch.
  ■ Add variables to the Watch window and single step your
    program from the breakpoint forward.