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Complain, complain ...
Maybe a night when my head feels like it's stuffed with cotton soaked in something volatile, a night when I'm craving parsley (often a sign I'm getting sick; hope that's not the case), isn't the right time to wrestle sound-easier-than-they-are sysadmin tricks that I know I've solved before but either hadn't used in a while or use in a "set and forget" manner so it's been long enough to forget how they were set up ...
But it seems that either using 'exportfs' on a downstairs machine so the bedroom machine can see the file I'm working on or using 'xhost' on the bedroom machine so that 'gv' running downstairs can display on the bedroom monitor, ought to be an Easy Trivial Everyday Task without a lot of manpage reading and swearing and confused looks.
Worse, I know I've made each of these work before ... (And yes, the file server is still not running. Ordinarily I just work in a shared $HOME directory from various telnet windows using whatever tools I need from each computer.)
So maybe this just isn't the right night to wrangle computers.