NC Environment variable                         Manual page 62
 Using the Norton Commander with a RAM disk presents a special
 problem: if you save the setup, or if you change the menu
 file or the extension file, these changes will be made to the
 files on the RAM disk.  Which means you'll loose your changes
 as soon as you reboot or turn off your computer.

 The Commander provides a solution to this problem.  You can
 put a line into your autoexec.bat file that tells the
 Commander where to find these files, as well as other file's
 it needs that you haven't copied to the RAM disk.  Put the
 following line into your autoexec.bat file:

          set nc=c:\progs\nc
                 +---------+
                      |
       The path on your hard disk where
       the Commander's files are stored.