Suggestions for the temporary windows used from the minibuffer

[Lennart Borgman]

For many commands using the minibuffer an extra temporary window is 
used, for example with C-h ? or with completions. I think it would be 
very nice if in all these the same keyboard command was used to scroll 
that extra window and to move into that window.

How about using <prior> and <next> (on w32 that is Page Up/Down) for 
scrolling that extra window? Could C-M-x o be used to move to that extra 
(other) window? Or maybe Tab since that is easier to type? (For 
completions an extra Tab could be used.)