Test case scripts are driven by the DDTT. The DDTT can be initiated via an OS/2 command line or from a batch file or REXX statement:

   [C:\TOPTICAL]DDTT OPTISTD.SCR

The DDTT creates a Presentation Manager thread window that consists of:

• a multi-line, scrolled output field for logging script progress

• a single-line entry field for operator input

• a single-line text output field for script-initiated prompts and messages

The DDTT optical tests must be executed on a directly-attached optical device. These tests will not work when executed against an optical device accessed by way of a network connection.