To start DDLab, at the DOS prompt enter ``ddlab`` (make sure you are in the directory containing ``ddlab.exe`` and the other files listed in #1). The ``DOS extender`` banner will briefly appear, and the program will start. To suppress this banner enter ``set dos4g=quiet'' at the DOS prompt before running DDLab. The following sections list all the various options and prompts with explanatory notes.
On start-up the user interface appears as described in #2.