Poker room comp system - how to keep track of played hours?

[RegBarclay]

Hi group,

our cardroom is working on a comp/rakeback/affiliate system and I would like to hear your input on how this is done in the larger cardrooms in the states.

We have up to 20 cash games running at once and keeping track manually is impossible. Do places like Borgata hand out comp cards which are checked in and out by the dealers at the table? If so, does anyone have an idea what system they use?

Regards,

RegBarclay