> However, any subsequent attempts to use that same port for sending 
> the UDP packet fail. Only after closing the socket used for 
> listening I can use that port for sending a packet.

But that's not a problem is it?  Listen, connect, send query, wait x 
seconds for responses, stop listen, repeat...

Does Windows not provide an API for UPnP discovery?  Certainly Windows 
Vista, which I'm currently playing with, has Function Discovery 
interfaces that do all this, Vista even found my Linksys wireless access 
point, mind it didn't find a proper display adapter and Vista is really 
painful in VGA. 

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