Loading Update across a network.

I have 1 win2K server, and 12 win2k cliant machines. Every time there is a sercurity update, driver update, or program update announced I have to go to all the computers and install each update or sets of updates on each computer. Is there anyway to have the server push out the updates to the client machines or am I just going to have to Update all the machines seperatly. If there is a way are there any online resources where i can read up on this more.

Thanks
Simon