DOS Command Exit
Type: Internal (2.0 and later)
Syntax:
EXIT
Purpose: Exits a secondary command processor.
Discussion
This command can be used when you are running an application program
and want to start the DOS command processor, then return to your
program. For example, to look at a directory on drive B while
running an application program, you must start the command processor
by typing COMMAND in response to the default drive prompt. You can
now type the DIR command and DOS will display the directory for the
default disk. When you type EXIT, you return to the previous level
(your application program).
Example
If you start a new command processor by entering
command /c
then you can return to the previous command processor by entering
exit
This page is from http://www.easydos.com. I pasted it on my website to avoid possible broken links. For further help with DOS commands, Check easydos.com out.