> IIRC, ioport_group is mainly used to group the various inputs in the Input (General) > configuration menu of the internal UI, and that's why you also have the IPG_UI & > IPG_OTHER and not only the IPG_PLAYERn... see src/emu/uimenu.c
Eta is correct. "player" is the player number in the game, "group" is primarily for the tab menu organization.
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