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Normally, each frame has its own minibuffer window at the bottom, which
is used whenever that frame is selected. If the frame has a minibuffer,
you can get it with minibuffer-window (see section Minibuffer Miscellany).
However, you can also create a frame with no minibuffer. Such a frame
must use the minibuffer window of some other frame. When you create the
frame, you can specify explicitly the frame on which to find the
minibuffer to use. If you don't, then the minibuffer is found in the
frame which is the value of the variable
default-minibuffer-frame. Its value should be a frame which does
have a minibuffer.
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