On Windows, Tru64 UNIX, and Linux systems, a program that is the user interface to the language compiler. It accepts command line options and file names and causes one or more language utilities or system programs to process each file.
The actual binary program in C, not LPC, that starts up the whole LPC environment and begins running the interpreted parts. It may be extended with a variety of packages and extensions, or be normal "vanilla" DGD. The driver implements common functions that programs can't do for themselves and that any big program is likely to need. See also MUDLib.