What is the use of subst in dos detail please?
It is a substitute command. Use the SUBST command to substitute
a drive letter for a path in order to treat a virtual drive (a
reserved area rather than an actual disk drive) as a physical
drive. Example: To create a virtual drive F for the path,
SALES\LETTERS (under the root directory) of drive C, enter subst f:
c:\sales\letters Read and write requests to either drive F or to
C:\SALES\LETTERS will be stored in the C:\SALES\LETTERS directory
area.