Nintendo DMG-01 - Game Boy Console Manual page 59

TM
Game Boy CPU Manual
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OBJ Characters (Sprites) can still enter the
window. None of the window colors are
transparent so any background tiles under the
window are hidden.
by DP
must be less than or equal to 166 for
window to be visible.
WX is offset from absolute screen
coordinates by 7. Setting the window to
WX=7, WY=0 will put the upper left corner
of the window at absolute screen
coordinates 0,0.
Lets say WY = 70 and WX = 87.
The window would be positioned as so:
0
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80
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Background Display
Here
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| 80,70
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2.13.1. I/O Registers
Window Display
Here
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Page 59