int  initPostscript(char ***mime_types, int *nrtypes, float **qual);
  int  openPostscript(const W3ADocumentInfo doc,  Widget  area, long id);
 int writePostscript(long id, const char *buf, size_t nchars);
  int  closePostscript(long id);
  int  infoPostscript(long id, W3ADocumentInfo *info);
 void eventPostscript(long id, long sourceid, long eventtype, void *params);