Network Administration/ Management

Ummm…i am trying to configure the networking in a small scale call centre. The main program in use is Linux based and therefore the server has CentOS release 4.4 All the other computer are running Windows Xp. I want to create a system whereby i can use one of the XP computers to administor all the others without touching the Server and also be able to view who is doing what and when, enable the users to log in with their own unique accounts from any of the computers and easily update or configure any of the computers from that main computer.