■ Allows you to simulate command-line input to your program
  from within the programming environment. Text input is
  uppercased and passed directly to the COMMAND$ function
  at run time.
 
■ You can use Modify COMMAND$ to:
    • Debug a project that uses the COMMAND$ function
    • Test a project's response to new command lines without
      switching between the programming environment and
      MS-DOS
 
■ To modify COMMAND$:
    1. Enter the command you want to test in the Enter text
       for COMMAND$ text box.
 
       Enter text for COMMAND$:
       ┌─────────────────────────────────────────────────┐
       │                                                 │
       └─────────────────────────────────────────────────┘
       • Up to 127 characters can be entered
 
    2. Press Enter or choose OK to modify COMMAND$,
       ╔════════╗
       ║   OK   ║
       ╚════════╝
       or choose one of the following:
       ┌────────┐
       │ Cancel │  To cancel the operation
       └────────┘
       ┌────────┐
       │  Help  │  To get help
       └────────┘