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Frames remain potentially visible until you explicitly delete them. A deleted frame cannot appear on the screen, but continues to exist as a Lisp object until there are no references to it. There is no way to cancel the deletion of a frame aside from restoring a saved frame configuration (see Frame Configurations); this is similar to the way windows behave.
This function deletes the frame frame after running the hook
delete-frame-hook. 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 the force is non-
nil, then you are allowed to do so.
The function
frame-live-preturns non-nilif the frame frame has not been deleted.
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.