samba - May 2003 - Disable Logging in with one acct. multiple times

Sorry if this question has been answered before, but I was unable to find
this information on my own.  I recently setup a Samba PDC for our community
tech center.  Roaming profile is working great but I need to be able to
restrict a user to only be logged in on one machine at a time.  I am running
Samba 2.2.8a on Red Hat 8.0 with kernel 2.4.18.

hostage