Point
input varName, "UIName", Point, x, y
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BlitAdditional Notes
the point input control yields confusing values.
don't expect the point control to return pixel values, instead it returns the proportion of the frame from the centre. So a selecting point at the top right edge of frame yields {-0.5, 0.5}. Even though the user sees pixel values in the control box.
It's quite clever really, but a bit confusing.

