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A live frame is one that has not been deleted. When a frame is deleted, it is removed from its terminal display, although it may continue to exist as a Lisp object until there are no more references to it.
This function deletes the frame frame. Unless frame is a
tooltip, it first runs the hook delete-frame-functions (each
function gets one argument, frame). By default, frame is
the selected frame.
A frame cannot be deleted if its minibuffer is used by other frames.
Normally, you cannot delete a frame if all other frames are invisible,
but if force is non-nil, then you are allowed to do so.
The function frame-live-p returns non-nil if the frame
frame has not been deleted. The possible non-nil return
values are like those of framep. See Frames.
Some window managers provide a command to delete a window. These work
by sending a special message to the program that operates the window.
When Emacs gets one of these commands, it generates a
delete-frame event, whose normal definition is a command that
calls the function delete-frame. See Misc Events.