[X-Unix] Remote force logout and lockout of user

[Craig A. Finseth]

   sure would be cool to find out that there is a unix-way to set a 
   enable/disable account bit for a user...

There is.  Change their login shell to /dev/null and change their
_encyrpted_ password text in /etc/shadow to something like "***no
login***" (or any other text that can _not_ be output by the crypt(2)
call).

These changes keep someone from logging in, but won't affect current
sessions.

Craig