🚀 go-pugleaf

I often edit from home, which is a DEC VT320 terminal, and I have a
printer attached to the terminal's printer port.  It is possible for
the host to send data which is printed but not displayed on the
terminal.  

I believe it is also possible in GNU Emacs to be printing one file or
buffer while doing something else which involves the screen.
Obviously this sort of capability would have to hook in at a fairly
low level in the main command loop so that printing was the lowest
priority activity, behind reading and executing the user's input and
updating the screen.  Has anyone done anything like this or even
similar?  I would appreciate any information or pointers, including an
*informed* opinion that it's Not Worth Doing.  It would be such a
tremendous personal productivity gain that I would like justification
for such an opinion, with details down to the C code level.  In case
it matters, my initial target environment for this is a Sun-4 with
SunOS 4.1.1B, and eventually I would like it to also work on Ultrix.$$
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