Parameter	Description
-ugob	use an user gob file (where gob=your gob file)
-shots	enable screen shot mode (use Print Screen key)
-c	disable cutscenes
-llevel	play a particular level (where level=yourlevel)
-xd	specify CD-ROM drive letter (where d=drive)
-f	don't check to see if FILES= is set high enough
-t	autotest mode (runs all levels briefly)
-g	create a text file with a list of all files that were opened during the running of the game