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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: a suggested solution for better external' completion in certain
 emacs modes
Date: Sun, 14 Nov 2004 01:01:12 -0500
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    > What exactly would tell Readline to start treating the pty that way?
    > That is, how does Readline know it is time to read a completion
    > command rather than a line of input?

    An environment variable on the sub-program invocation.

The environment variable can't be changed during sub-program execution.
Are you saying that ALL communication with the subprogram will
use this new command protocol?  Not just when the user asks for
completion?