To use the XGP spooler for printing a file, use:

.XS <FILE SPEC>
        or
.XS <FILE SPEC>/FONT=<FONT FILE>

For details on other switches, see the Monitor Command Manual, online as
MONCOM.BH[S,DOC].

Other relevant programs include PUB, POX, XGPSYN, XGPTYP, UNXGP, EDFONT,
TVFONT, FMUNGE, FONT, XPART, and FSCALE.  See their respective
documentation files for info.  Type HELP XFONTS for a run-down of XGP
font-related stuff.

For a description of XGP file format and other details regarding
outputting to the XGP, see the section on the XGP device in the UUO
Manual (online as UUO.ME[S,DOC]).