What would be the best way to run python client in the background

[gel]

Hi
I have written a python client server app that keeps an eye on
processes starting and ending on a client and makes decision on what to
do based on information from the server end.  I want to run the client
end of the app more or less invisibly (no console) on the XP clients
when ever a users logs on.  What would be the best way to get this
done?  A bit more info on the purpose of the app... it is to act as a
licence server, where we have a limited number of licences for software
and the software installed on all PCs.  The app will only allow a pre
defined number of clients to run the software at any one time.