Session Still Active

Hi,

Does anybody know whether, given an IP Address, it is possible to see if that machine is still active on the server.

Basically, I capture details of the IP Address of users who hit our webserver. Hourly I want to check whether those connections still exist. If so, keep the document - otherwise, remove it from a database.

The system is used for external clients as well, who don’t have Address book entries - hence why I’m having to store IP Addresses.

Thanks in advance!