Follow-up Comment #5, bug#64484 (group groff):
Another oddity is that you can invoke the `device` request too early, and it
won't be honored, but can use `\X` anywhere you want.
$ cat EXPERIMENTS/device-control-escape-sequence.roff
\X'ps: nop'
$ ~/groff-stable/bin/groff -Z EXPERIMENTS/device-control-escape-sequence.roff
x T ps
x res 72000 1 1
x init
p1
V12000
H72000
x font 5 TR
f5
s10000
V12000
H72000
md
DFd
x X ps: nop
n12000 0
x trailer
V792000
x stop
$ cat EXPERIMENTS/device-control-request.roff
.device ps: nop
$ ~/groff-stable/bin/groff -Z EXPERIMENTS/device-control-request.roff
x T ps
x res 72000 1 1
x init
p1
x trailer
V792000
x stop
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