This section outlines the main differences in using document tools between SunOS release 4.x and the Solaris 2.6 operating environment.
The Solaris 2.6 operating environment provides a set of PostScript filters and device-independent fonts. However, most SunOS release 4.x TranScript filters have SunOS release 5.6 equivalents while a few less common ones do not. In SunOS release 5.6 systems, there is no TEX filter, no pscat (C/A/T) filter, and no raster image filter.
The Solaris 2.6 operating environment provides device-independent troff, with the following features: SunOS release 4.x troff input files work with Solaris 2.6 troff; troff default output goes to the standard output instead of the printer. Therefore, you must specify a printer when you send troff output to the printer.