Sign-on exit point

Is there an exit point for user validation at sign-on? We are looking into
the posibility of locking a sepecific user(s) after a number of invalid
logons differently than all the other users. I see I can't do this through
their profile alone, so I am hoping I can do this through an exit point. I
don't have much for details myself yet, but I assume this is for any service
that a person might sign on under (example Web, green-screen, ftp, vendor
application thin client, etc).

--
Mike Wills
koldark@xxxxxxxxx
http://mikewills.name
Want Gmail? Email koldark+gmail@xxxxxxxxx to get on my waiting list.

"There are 10 types of people in the world: those who understand binary, and
those who don't." -Unknown