Re: a suggested solution for better external' completion in certain emacs modes

[Richard Stallman]

    What about history? Emacs' comint mode keeps quite a small history by
    default and also doesn't save the history in a file, many Readline
    programs do offer this.

If you are using comint, you have all the history in Emacs.
The history commands do not need to interact with the program.

    So I was proposing a completly new way of communicating with
    Readline. 

I thought these command would go thru the pty to the subprogram.
Are you thinking that Readline would talk to Emacs thru a socket?
That's ok if you make it work.

But you have not said what method of communication you have in mind.
Would you please say what it is?