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====== GetMouseScrollDelta ======
GetMouseScrollDelta(true) ->val

===== Description =====
Returns a positive or negative number when the mouse scroll wheel is rotated.
The magnitude of the number is proportional to the amount the wheel is scrolled.
The argument to GetMouseScrollDelta indicates whether to ignore the scroll events when over the UI.

===== Examples =====
<code 4rpl>
GetMouseScrollDelta(true) ->zpos
SetUnitPosition(<-uid V3(10 1 <-zpos))
</code>
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