|How to test the theory???? I wonder if maybe you turn off the desktop PC and see if the laptop still connects to router/internet, you might just be able to work out the answer.|
Your only problem ( not a biggie) comes when you need to log into the router admin to change any settings. This can still be done from the laptop even wirelessly but is best done with a wired lan connection, so keep the desktop lan cable.
Goin' Fishin' (Some day)