You can get information about computers in your domain using WMI or the System.Management class (there is info and examples
here[
^])
Control and track their activities? Why do you want to do that?
"actually i m developing an application in VB.NET for Automated CyberCafe management where in which 1 Central or Server will be there and it should manage and track all the activites of computers connected in the network...."
Ooooh! I'm not sure I like that! The only reason I would use a cyber cafe is because I was away from home and needed to do something urgently: I don't think I want to be "Controlled and tracked" while logging in to my email, or bank account...:~