The card contains a bar code which is how it knows who it is (btw i just think this is how it works, and it probably is actually how it does it cuz it is the most reasonable answer i could think of) and then you swipe the card to a game and then it identifies that it is you, and there is probably a machine that is connected to all the games so all the points you earn goes to that machine and somehow they find the points on the card... that last part i have no clue what the answer could be...
All of your "tickets" (now points) are saved on the card, so keep it when you are done and use it next time you go.
You can load it at the kiosk with either cash or a credit card.
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