What is $FFFF ?

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Well I am both, but I still don't get how you can just plug the sequince rgb=ReadPixelFast(x,y) And $FFFFFF.
Not to mention the part about putting And after a statement, I thought that it was for conditional checks you know like
If $FFFF and (binary <> Question) then ect you know the rest.
I know binary. I saw it on TV once. You got eggs that fill containers (shaped like eggs) and each container holds a byte (and salt and pepper).