actionslots are the DPAD buttons. Just the regular stuff that would be assigned to it via the game or the mod itself. ie when you have a predator drone for the Sniper-Fi Mission, the RIGHT Button on the DPAD activates it, the Right Button is an actionslot. And yeah, you loose sync a lot if your trying to do too much at once, when your playing the mission, let who ever the second person is inside your game do everything. I don't think you can 'infect' other people, because i've tried to do that, by just letting them play with me, and going to Solo. It didn't work.