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INQDP

       SUBROUTINE  INQDP (FRONT,BACK)
 C$    (Inquire View Depth)
 C$    Return the  current  values of  the  Front and  Back  Plane
 C$    Distances in the  viewport, measured  in world  coordinates
 C$    relative to the View Reference Point.
 C$    (01-APR-82)