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INQVP3

       SUBROUTINE  INQVP3 (XMINP,XMAXP,YMINP,YMAXP,ZMINP,ZMAXP)
 C$    (Inquire 3-D Viewport Size)
 C$    Return the  current  values  of the  3-D  viewport  extents
 C$    measured in Normalized Device Coordinates (range 0.0..1.0).
 C$    (01-APR-82)