There are two Imagen printers available (soon perhaps more).  They accept the
same file formats, although they print at two different resolutions and are
controlled by two different spoolers: the ESP spooler and the IMPRINT spooler.

The ESP printer(s) have 300 dots per inch; the first one is located in MJH 343
(small room opposite the MJH lounge).  These printers are connected to the
Ethernet and thus are generally reachable from any Ethernet host with
appropriate spooling software.  (SAIL is the first host with an ESP spooler.)

The IMPRINT printer has 240 dots per inch and is located in room 030 in the MJH
basement.  It is directly connected to SAIL, and so can be used only from SAIL.

The file format used by all of these Imagen printers is called imPress format,
in which the glyphs representing the fonts being used are actually contained in
the file along with whatever graphics and text are to be printed.  The SAIL
spoolers (ESP and IMPRINT) can convert plain text into imPress files to be
printed, using the XGP font of your choice (someday, TEX fonts will be handled
by the spooler's text to imPress conversion).  A file already in imPress format
should have extension .IMP or be spooled with the /IMPRESS switch.  TEX output
(DVI files) can be sent to the ESP spooler by the program DVIESP (R DVIESP will
run it).

Here are the monitor commands for spooling, showing status, and unspooling:
    ESPOOL <filename>       spools the file for the ESP printer
    IMPRINT <filename>      spools the file for the IMPRINT printer
    Q/E                     reports the ESP spooler status
    Q/I                     reports the IMPRINT spooler status
    UNSPOOL                 allows you to cancel any spool requests of yours

For complete spooler documentation, see the SPOOL appendix of the Monitor
Command Manual, online as MONCOM.BH[S,DOC].