A frame is a rectangle on the screen that contains one or more Emacs windows. A frame initially contains a single main window (plus perhaps a minibuffer window), which you can subdivide vertically or horizontally into smaller windows.
When Emacs runs on a text-only terminal, it starts with one terminal frame. If you create additional ones, Emacs displays one and only one at any given time--on the terminal screen, of course.
When Emacs communicates directly with a supported window system, such as X Windows, it does not have a terminal frame; instead, it starts with a single window frame, but you can create more, and Emacs can display several such frames at once as is usual for window systems.
t if object is a frame, and
nil otherwise.
See section Emacs Display, for information about the related topic of controlling Emacs redisplay.
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