Mystery WiFi network shows up when laptop is connected
Solution 1:
Its related to screen casting - which uses miracast and wifi direct. The feature is called "Projecting to this PC" and found under "connect" in the action center . Its a new feature with windows 10 anniversary update, and lets you use miracast to send the output from one system to another (works with my android marshmallow android phone as well, to an arbitrary system).
Turning it off and on makes that device appear and disappear.
