Maybe you could use acl rules? Supposed that the users can be distinguished by IP address or hostname.
And this way you could only have static timing: you could set when and (how long) a machine can use the proxy, but you cannot treat them like this: this machine tries to connect, let it in and let it use the proxy for one hour then disconnect it.
I do not know how this could be handled dynamically (if that is what you want)
Last edited by J_Szucs; 10-12-2003 at 04:26 PM.