Why is There a Circuit Board in the DS Lite GBA Slot Cover?

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Insert your Game Boy Advance cartridge on the bottom slot of your DS This is labeled for you next to the slot as Slot-2

All of these features can be unlocked without having to put any of the GBA cartridges in Slot 2 of the Nintendo DS Final Fantasy Tactics A2: Grimoire of the Aside from removing the ability to play the huge library of GBA games, it also prohibits the use of many nifty Slot 1 devices Now we hear that

united states lottery The Nintendo DS Lite slot cover is enclosed in the original Nintendo DS Lite packaging and is used to protect Slot-2 for Game Boy Advance games  My goal is to reverse engineer the protocol, but I have no idea where to even start Specifically: How does the DS game know which GBA game is