The TEXPrt program can either be executed in a shell using parameters or from Workbench using ToolTypes. When launched from Worbench, a DVI file can be selected by first selecting the TEXPrt icon, holding the SHIFT key, and double clicking the desired DVI file. Having started TEXPrt, the program first looks for DVI driver specification files located in a subdrawer named TeXDrivers. If this drawer is empty or contains no valid specification file, the program exits with an error message. For more information on DVI driver specification files see the appropriate chapter below.