NOTE: Users' automapping is absolutely optional!
If you have a large number of accounts on your Linux-machine, you may want to map all Linux-logins automatically to "mars_nwe"-logins.
WARNING: as there is no algorithm to convert the encrypted "Linux-passwords" into the encrypted format used by the DOS-clients (and therefore "mars_nwe"), you have to supply a common password for all automatically mapped users. This is a big security concern and you should never make this common password public (and, of course you should choose a sufficient "secure" (read: difficult) password).
Do the automatic mapping.
Re-read the logins from /etc/passwd and overwrite even the already existing logins from the bindery.
The common password to be used by the automapped users.