Trying to limit pptp connections

I am trying to limit each entry in chap-secrets to one simultaneous
connection per user/pass. In other words, no more than one person can
be using the same user/pass in any given time.

Some information...
[root@rickp4a root]# pptpd --version
Poptop v1.2.1
[root@rickp4a root]# radiusd -v
radiusd: FreeRADIUS Version 1.0.1, for host , built on Oct 28 2004 at 09:38=
:42

I am pretty sure it requires freeradius, I read somewhere. As far as
the config options in what files I'm still pretty confused... can
someone help? Please be as specific as possible, I've been working on
this project for weeks now and finally decided to mail the mailing
list.

Thanks guys,
Bob

-
List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html