The fax option for the LaserWriter 16/600 PS is the same implementation as our previous PostScript fax printers (LaserWriter Select 360f and the LaserWriter Pro 810f). We have verified the functionality of PostScript fax for the NT Advanced Server.
PostScript Fax also works for PathWorks, however, only with the standard LaserWriter 8.x drivers and selecting "fax" as the destination. Using the LaserWriter 8.xf fax drivers seem to cause issues with the PathWorks print queue. When printing from the client Macintosh, you must manually select the corresponding fax PPD in order to utilize the printer's fax capability.