Here's an alternative suggestion for identifying the terminal
implementation: Implement the DA3 sequence and implement the extension
proposed below.

DA3 is supposed to elicit a globally unique, persistent terminal
identifier (its serial number if you like), as documented here:

http://www.vt100.net/docs/vt510-rm/DA3

However that makes little sense in a world where most(?) terminals are
emulated and does not apparently even work on a real VT5xx (just returns
00000000 as the id). So the following extension is proposed.

Respond to DA3 with DCS!|00000000;swidST where swid identifies the
software product name and version. The syntax of swid could be borrowed
from RFC 2616 (HTTP 1.1) Section 3.8. I would prefer that product names
are explicitly qualified by (preceded by) the Java-style label-reversed
domain name. Hence a company called PCsoft that registers pcsoft.com and
sells a product called SuperTerm might send a product name and version
of com.pcsoft.SuperTerm/1.0

(DA3 is seemingly not implemented at all in xterm so there is minimal
scope for breakage in that regard.)

Product names should be compared without regard to case.

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

Title:
  gnome-terminal doesn't recognise C1 controls

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