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GetClientRect()
Return the client co-ordinates of a window
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Syntax
GetClientRect( <hWnd> )   -->   aRect

Arguments
<hWnd> is the handle of the window whose co-ordinates are
wanted.

Returns
An array  { <nLeft>, <nTop>, <nRight>, <nBottom> } giving the
co-ordinates of the window's client area.  Note the order of
these co-ordinates may not be what you expect.

Description
This function returns the co-ordinates of a window's client
area (the area an application can write to), relative to the
window's upper-left corner.

The <nLeft> and <nTop> values are always zero (0).

Example
// Get the width of the window
aRect = GetClientRect( hWnd )
nWidth = aRect[3]