Is it possible to install OS on more tha 1 PCs?

[fatguysmart]

Hello people,
I want to know if I can Install windows XP on PCs on my LAN without actually installing it individually on every PC.
or Should I install it individually on each PC and then connect them through LAN to the local server?

Thank you people!

[shantanu]

Ya You Must Install It To Al Pcs Ealse You Can Also On A Single Pc By Installing Lan Boot Rom Cards This Setup Is Called Thinklined