On Fri, 17 Dec 2010 03:44:55 -0800 (PST), GrtArtiste
wrote:

Unsecured wireless network with 2 computers connected-1 Vista
desktop-1 Win7 laptop. If I suspected that another computer running
Linux was connecting to my network, would there be a pop-up or
something to alert me? If not, where should I go looking to find out?
Thanks for any assistance.

Unsecured means just that ; doubt there would be any pop-ups . Look
within the prescribed radius .