GPHIGS creates a PostScript file. The name of the file is defined by the connection identifier parameter of OPEN WORKSTATION.
C syntax:
popen_ws (ws_id , "my_file" , PWS_TYPE_POSTSCRIPT_BW_A4);
FORTRAN syntax:
OPEN(CONNID,FILE='my_file')
CALL POPWK(WKID,CONNID,80791)
The new file contains a prologue that defines the procedures used by GPHIGS. This prologue is read from a file called gphigs.ps, for the grayscale driver, and gphigs.psc, for the color driver, both of which may be found in the run_time directory . The file may be freely edited to include definitions specific to each printer or interpreter. E.g. the definition of character fonts may be changed.