it also works with right and left- it turns your screen sideways- really useful when you have to read a pdf thats printed partially sideways or just with long pages and you dont want to have to hit down every three and half seconds.
just kiddidng. You open system prefrences. then hold down option and command and click display. select to revert the screen by 180 degrees. click confirm. It may take up to 15 secs to change. then do it again to change back
Syag, actually I was on the old thread when it was active, I remembered it but i didnt want to bump it cuz it said how to get it back to normal. I originally posted this on the original thread anyway….