We use answerback extensively in order to identify the make and model of
terminal i.e. every terminal that we have, physical or emulated, is
configured to respond to ENQ with its make and model (followed by a
carriage return).

In an ideal world we would not have to do this because every terminal
emulator would emulate perfectly the make and model of real terminal
that it claims to emulate.

Knowing the actual make and model allows us to account for quirks and
limitations of individual emulations e.g. knowing that I have to send
ESC[?40h for a width change.

Considering that the code bothers to recognise the ENQ - but
deliberately sends no response - even if it just returned the value of
an environment variable that I can set, that would be workable, although
a command line argument or something out of the profile would be better.

Bear in mind that the starting point of this was ... why am I using
PuTTY and what would have to change in gnome-terminal for it to replace
PuTTY? Answerback works in PuTTY.

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https://bugs.launchpad.net/bugs/1297051

Title:
  gnome-terminal doesn't recognise C1 controls

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