DOS Access
 Shell to DOS... come in DOS... Do you copy?
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 Gives you access to the DOS prompt. Basically this option runs the
 CA-Clipper RUN command, unless you use Blinker.

 If you are using Blinker, then we would recommend that you either link in
 the blinker SWPRUNCMD() function or announce it to the compiler, either with
 the EXTERN statement or the REQUEST statement - although if you use the
 EXTERN statement, you could save the compiler precious nanoseconds whilst it
 pre-processes REQUEST into EXTERN when compiling.

 With SWPRUNCMD() linked in MrDebug will use it to shell to DOS - this will
 give you a lot more free conventional memory within the DOS shell.

 NOTE: Any environment variables that you set within a dos shell from MrDebug
       will be lost when you exit the shell.