Search the CONFOCAL archive at
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal

We are using the Arizion Research Labs OCF Scheduler. Perhaps this is the same one Carl Boswell 
is using. It has a Linux server for the user database and for authentication but has local logon and 
logoff scripts to track usage on Windows machines. It is available free from ARL. The link is:  
http://demo.arl.arizona.edu/

The fact that you need a Linux server should not be a stumbling block. All we did was take an old 
PC and reformat the disk to run Linux Fedora. Once it is up and running you don't need to know 
much about Linux to maintain it and there is a convenient GUI to interface with the database if you 
need to. They provide the source code, so if you do have someone who is Linux savvy, you can 
customize it. For example, we changed some of the forms involved in making accounts to conform 
to our needs (six digit account numbers; extra fields, etc.).

You might even be able to use the logon and logoff scripts without the Linux server. All they do is 
write to a log file when a user begins or ends a session. You could then use the log file to compile 
usage statistics without the Linux database. 

I tried a bunch of internet cafe programs before settling on this. They worked but were not really 
suitable for a core facility and sometimes they screwed up my network settings in ways that were 
difficult to track down and fix. One of the things we like about OCF Scheduler is that it doesn't 
affect the local network settings at all.

If you decide to go this route, feel free to email me directly with questions.

Kate