Question : Software inventory on client PCs

Hi guys,

I need to learn which softwares are running on each client PCs in my domain.
Could you suggest a software can help me do this with a centralized way. I mean by not installaing any software manuallay at client PCS.

thanks

Answer : Software inventory on client PCs

Reread your question and thought of an even better one. Here is the best thing I have come across for smaller domains.
http://manageengine.adventnet.com/products/service-desk/index.html?ad-main
It's free for under 50 computers and does everything you want and more.