That is a good question.
I expect that for some systems, such as consoles, the list of known games is fairly complete, but probably not built into any emulator in a meaningful way.
I would think that you would have to scan the set of disk/tape/cartridge/ROM/whatever images available to the emulator to know what games can be played.
MAME is somewhat unique in that it has built-in knowledge of every game that it is capable of emulating, and can report that in an ingestible way.
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