Many airline louges offer computers with Internet access.
What I am now seeing more of (for example, 2 in 1 lounge this morning!!) is people sitting at these computers without using them!! This is not only rude and selfish, but may prevent others from actually using the computer.

How can this be stopped!?

This, to me, is almost as selfish as people putting their carry-ons in lounge showers for safe keeping while they themselves stroll about the airport.