SETCWD -- Set current working directory in environment.
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This program will set the environment variables CWD and DRV to the
current working directory and current working drive. In bat-files
they can be used to return to that drive and directory by setting
a %DRV% and a CD %CWD% in the bat-file.
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This is an updated version of SETCWD on special request that also
will set the VOL environment variable at the current volume name.
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Bart Mellink, Cyco Automation, The Netherlands.