Copy to Printer is a simple utility program that will send any file
directly to any printer Windows knows of. A typical use of this is to
send a PostScript file to a laser printer, which knows how to handle it.
You can also send to any printer the .prn file generated when printing
something after selecting the option ?Print to a file?.
In the old days of DOS you did this by typing in the command file
something like
copy /b filetoprint prn
and you can still use this, but only with printers attached to a port
(prn, lpt1:, etc.) known to the command line interpreter. This is not
enough with networked printers. Sure, under NT/2000/XP you can use lpr
for the later, but not for local printers.
Copy to Printer is intended to be a friendly substitute for lpr which
works with any printer (local or networked) accessible from your
computer and has some features to help you configure the printer (to
print on both sides of the paper, for instance), make several copies
etc.
http://tp.lc.ehu.es/jma/win95.html