Associates a path with a drive letter.

SUBST [drive1: [drive2:]path]
SUBST drive1: /D

drive1:        Specifies a virtual drive to which you want to assign a path.
[drive2:]path  Specifies a physical drive and path you want to assign to
a virtual drive.
/D             Deletes a substituted (virtual) drive.

Type SUBST with no parameters to display a list of current virtual drives.