Re: comint.el: EMACS environment variable

[Richard Stallman]

    I believe it's important to distinguish term from comint: the reason why
    external programs sometimes want to check is EMACS=t (or now INSIDE_EMACS=t)
    is because they need to adjust to the peculiar way comint interacts with
    its inferior process: on the one side it's interactive, but on the other it
    sends whole commands at a time (the inferior process doesn't get to see
    keystrokes).
    OTOH term.el interacts with its inferior processes pretty much like xterm or
    any other terminal emulator would.

    So I think setting EMACS to t in comint and to something different (namely
    <version>) in term was no mistake.

It is a good point that they should be different.  However, we want to
stop setting EMACS in term for the same reason we do in comint.
So we should set INSIDE_EMACS in both cases, but use different values.

How about the Emacs version followed by either `(term NNN)'
or `(comint NNN)'?  That way programs that want to distinguish
can do so.