We're talking about the difference between a rotating monitor where Windows is set for landscape orientation vs. portrait orientation. If all of my MAME games and pinball tables are set up for a rotating monitor vs. a fixed-position one, it's frustrating to have to do numerous workarounds to get laserdisc games to do that as well (and still not have a working scoreboard for Dragon's Lair/Space Ace). I'm not willing to commit my main monitor to portrait orientation 100% of the time when none of my regular applications are practical that way.
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I have officially retired from sucking at everything I do. Life is much easier now.