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 SetViewPortExt     Sets the X and Y dimensions of the viewport
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 Syntax:            <oPrn>:SetViewPortExt( <nXExtent>, <nYExtent> ) -->
                              <nPrevViewPortExt>

 Parameters:

 <nXExtent>         Specifies the new X-extent and Y-extent, in device
 <nYExtent>         units of the viewport.

 Returns:           The return value is the previous viewport extents, in
                    device units, if the function is successful. The low-order
                    word contains the previous x-extent; the high-order word
                    contains the previous y-extent. Otherwise, the return
                    value is zero:

                    <nPrevXExtent> =  nLoWord( <nPrevViewPortExt> )
                    <nPrevYExtent> =  nHiWord( <nPrevViewPortExt> )