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These functions and variables deal with recursive minibuffers (see Recursive Editing):
This function returns the current depth of activations of the minibuffer, a nonnegative integer. If no minibuffers are active, it returns zero.
If this variable is non-nil, you can invoke commands (such as
find-file) that use minibuffers even while the minibuffer window
is active. Such invocation produces a recursive editing level for a new
minibuffer. The outer-level minibuffer is invisible while you are
editing the inner one.
If this variable is nil, you cannot invoke minibuffer
commands when the minibuffer window is active, not even if you switch to
another window to do it.
If a command name has a property enable-recursive-minibuffers
that is non-nil, then the command can use the minibuffer to read
arguments even if it is invoked from the minibuffer. A command can
also achieve this by binding enable-recursive-minibuffers
to t in the interactive declaration (see Using Interactive).
The minibuffer command next-matching-history-element (normally
M-s in the minibuffer) does the latter.