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ScreenToClient()
Convert a point's screen co-ordinates to client co-ordinates
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Syntax
ScreenToClient( <hWnd>, <aPoint> )   -->   nil

Arguments
<hWnd> is a handle to the window whose client area is to be
used for the conversion.

<aPoint> is the point, specified as an array { x, y } giving
the x- and y- position of the point.

Returns
NIL.

Description
This function converts the co-ordinates in <aPoint>, assumed
to refer to a point on the screen, to new co-ordinates,
relative to the window specified.

The inverse function is ClientToScreen().

Example
aPt = { 320, 240 }
ScreenToClient( hWnd, aPt )
// now aPt[1] is x, aPt[2] is y