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PRSTWD

       INTEGER FUNCTION  PRSTWD (UNITNO)
 C$    (Parse Internal - Terminal Width)
 C$    Given a FORTRAN unit number corresponding to an OPEN  file,
 C$    return as a function value  an integer giving the  terminal
 C$    width.  A returned value of  0 indicates that the width  is
 C$    unknown or that the file is not directoed to a terminal.
 C$
 C$    In general, this routine will be system-dependent, and this
 C$    portable version simply returns 0.
 C$    (14-Feb-1991)