Client Tracking Software

Any free software to monitor internet actitives on a selected client pc ?

I need to track selected client pcs for the internet usage (browse/downloads), and if required block it. Is there anyway to monitor them without installing any client s/w on those machines ? its a small windows 2003 based network with adsl modem connected to my XP pc with internet connecton sharing enabled.

Public Comments

1. www.getsomesoft.com/software-monitor-r0-o3-w2-p9.html