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I run into quite a predicament, concerning MAME. In modern windows, pressing Ctrl + Alt + arrow, rotates the screen... From such an action, utter, complete chaos ensues (until you rotate back, they have killed you in-game, or MAME crushed, or something else is pressed and something else happened, etc...). Sad as is, those two buttons are the main ones, other than spacebar and possibly Shift, that MAME uses for main actions in all effing game roms.

Trying to go through the options, i was completely unable to locate a "Change buttons/keys/controls" section/panel/whatever. I would appreciate any help, since there are people around here too, who still arcade. Just before you call me names, i am talking about the LEGAL, free roms, offered from the official page of the devs; thank you (in advance)!
This question / problem has been solved by JMichimage
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KiNgBrAdLeY7: In modern windows, pressing Ctrl + Alt + arrow, rotates the screen...
It's not modern windows. It's your GPU software. Go look there to disable it.
I recall it being there in the Intel control panel, though I don't recall it in the NVidia Experience. Can check the AMD one too if you want, but it will take some time.

To change the MAME keys, run a game, press tab, then select "Input (this game)". I'm not sure if there's also an "Input (all games)" or similar option, but do take a look.
Here you go
Thanks! Wish i could choose you both...
Good luck with your gaming.