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Every dongle is now answered the way the real one answers. Each generation from 1999 to 2007, and the IGO 8 Italy part, was put on a real parallel port and questioned directly and through its own games, and the emulated dongles were corrected to match. What they served before was partly reconstructed from recordings and guesswork; now it is measured.
I.G.O. 5's button faces display correctly. They are enciphered with the dongle, and the emulated part answered the game's check in a way no real dongle does.
I.G.O. 6 and I.G.O. Italy recognise their dongle the way a cabinet does. Both menus try two passwords in turn; the emulated part used to accept the wrong one, and the banner only came out right by accident. It now refuses it like the real dongle, and they settle on the right one.
I.G.O. 3 no longer depends on the check table hidden on its disk (GAMESTAT.OLD). The dongle arithmetic that table records has been worked out from a real dongle, so the emulated part computes the answers itself -- all 1,912 of the table's entries come out right in every mode.
Photo Play 2000 and I.G.O. 4 get their dongle's real answers, including the whole picture-key table, read off a 2000 dongle in 1,024 queries, and anything the real dongle refuses is refused the same way. I.G.O. 4 turns out to use the 2000 generation's dongle, not one of its own.
Photo Play 2001, and I.G.O. 3 and 5, get their own dongles' answers where they used to get the I.G.O. 2 dongle's.