"Bring your tablets! Connect your cell! Come one come all! Connect all day, stay all night!" works a lot better than fighting and searching for rogue hardware that has been plugged in to USB ports.
What does this do to your internet bandwidth? In my experience just a few people streaming Pandora or Netflix can bring a network to its knees unless there is a buttload of bandwidth.
Seriously, what speed is your internet?
Ken Dibble www.stic-cil.org