NGCKOP - a function to check if a specified GKS workstation is open.

       To  use NGCKOP or c_ngckop, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably in
       that order.

       The C binding argument descriptions are the same as the FORTRAN argument descriptions.

       #include <ncarg/ncargC.h>

       int c_ngckop(int wkid)

       Copyright (C) 1987-2009
       University Corporation for Atmospheric Research
       The use of this Software is governed by a License Agreement.

UNIX                                              October 1996                                    NGCKOP(3NCARG)

       WKID        (an input variable of type INTEGER) specifying a  GKS workstation identifier.

               IOPEN = NGCKOP(WKID)

       sets IOPEN to "1" if WKID is open and sets IOPEN to "0" otherwise.

       NGCKOP - a function to check if a specified GKS workstation is open.

       Online URL: http://ngwww.ucar.edu/ngdoc/ng/gks/gkshome.html

       INTEGER FUNCTION NGCKOP(WKID)

       The function returns a "1" if the workstation identified by WKID is open, otherwise it returns a "0".