Re: Bikeshedding go! Why is <M-f4> unbound?

[Stephen J. Turnbull]

grischka writes:
 > > What I really hoped to discuss where the technical difficulties. Emacs
 > > does not currently have a way to let key binding fall back to the OS
 > > binding. I am not sure it is trivial and I have forgotten the details.
 > 
 > It is nontrivial to say the least.
 > 
 > Unlike XEmacs, GNU Emacs is still a console application at its heart.
 > It wants to "read" events in a loop from an input stream until it
 > finds them complete as a "key-sequence".  No function seems to exist
 > that could deal with events that are already read.

Surely (GNU) Emacs has a way (in Lisp, even) to "unread" a keystroke?
This kind of lookahead is the most convenient way to think about input
methods, for example.