I wish to automatically and stealthily check on the usage of computers on our LAN. We run a small Internet cafe and we need to protect public computers from misuse (we suspect staff coming in at night to download stuff). At this stage, all I need to see is when computers were on and when they were switched off. Also being able to log the sites and ports visited/connected to and MB up/downloaded would be an advantage. We are connected via a Cisco 1700 with OS version 12.1 and we cannot at the moment afford a hardware firewall (we are in a poor country). Some freeware or low-cost software is needed. Maybe we have a functionality in XP which I am not aware of.