[quote=McFazzer]
Quick question, if Jester can activate pain receptors, or something similar, can he force people to login to Deep Ground by activating whatever login procedure the game has?
[/quote]

In theory, yes, seeing as it is the program itself. The reason it's able to control pain receptor is because all chips are connected to their user's brain (temporal, frontal, etc.) If it wanted to, it could potentially control weak-willed people fully, though that might be a last resort for its "research".