Help of the DOS Command
Associates a path with a drive letter.:
SUBST [drive1: [drive2:]path] SUBST drive1: /D
Specifies a virtual drive to which you want to assign a path.
Specifies a physical drive and path you want to assign to a virtual drive.
Deletes a substituted (virtual) drive.
Type SUBST with no parameters to display a list of current virtual drives.
Above text is generated from DOS/Windows command help and re-formmatted for PDF/HTML View.