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<P>The SNES' Windowing registers are used for clipping; that is, cutting
off portions of the screen.&nbsp; If you run Mario World, you'll notice
a "circular opening" on the opening screen.&nbsp; This is done using windowing,
which clips off the parts of the screen outside of the window.&nbsp; The
clipping is only applied to BG1, BG2 and sprites, so that the big letters
"Mario World" (BG3) are always visible.&nbsp; Windowing has only a left
and right value, so what Mario World and many o