The SET directive is used to add or modify environment variables.  It
is equivalent to the SET command that can be used interactively or in
a batch file, except that the SET directives in CONFIG.SYS control the
master environment for all windowed or full-screen processes.

Directive syntax:	SET name = value

Default value:		Not applicable

Multiple occurrences:	Yes

Affects protected mode:	Yes
			
Affects real mode:	No

Example:		SET LIB = C:\PMSDK\LIB

