🚀 go-pugleaf

          I am using four different fonts in the same document.  Three
          of them are the run-of-the-mill roman, italic and bold which
          are loaded in positions 1 2 and 3.  I want to refer  to  the
          fourth  font  in  a  generic  manner, in such way that I can
          print the document in different typesetters  without  having
          to  do  major  editings  in  the document.  I will alternate
          between a PostScript laser and an  APS  typesetter.   Since,
          similar   fonts  have  different  designations  in  the  two
          printers, if I use the  escape  sequence  "\fxx"  to  change
          fonts,   I have will to edit every occurrence of that string
          when I change printers.

               I tried to load the extra font in a  preselected  posi-
          tion with the troff command

                          .fp 4 xx


               Troff gives an error message:

                          "font xx is to big for position 4"


          Apparently (according to the local troff guru) ".fp" behaves
          differently from machine to machine.

               How do I assign symbolic names to fonts in  the  begin-
          ning of the document?  Any suggestions?