(xemacs.info)Completion Example

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6.3.1 Completion Example
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A concrete example may help here.  If you type `M-x au <TAB>', the
<TAB> looks for alternatives (in this case, command names) that start
with `au'.  There are several, including `auto-fill-mode' and
`auto-save-mode'--but they are all the same as far as `auto', so the
`au' in the minibuffer changes to `auto'.

   If you type <TAB> again immediately, there are multiple
possibilities for the very next character--it could be any of `c-'--so
no more characters are added; instead, <TAB> displays a list of all
possible completions in another window.

   If you go on to type `-f <TAB>', this <TAB> sees `auto-f'.  The only
command name starting this way is `auto-fill-mode', so completion fills
in the rest of that.  You now have `auto-fill-mode' in the minibuffer
after typing just `au <TAB> f <TAB>'.  Note that <TAB> has this effect
because in the minibuffer it is bound to the command
`minibuffer-complete' when completion is available.