— Function: window-live-p window

This function returns nil if window is deleted, and t otherwise.

Warning: Erroneous information or fatal errors may result from using a deleted window as if it were live.

— Command: delete-window &optional window

This function removes window from display, and returns nil. If window is omitted, then the selected window is deleted. An error is signaled if there is only one window when delete-window is called.

— Command: delete-other-windows &optional window

This function makes window the only window on its frame, by deleting the other windows in that frame. If window is omitted or nil, then the selected window is used by default.

The return value is nil.

— Command: delete-windows-on buffer-or-name &optional frame

This function deletes all windows showing buffer-or-name. If there are no windows showing buffer-or-name, it does nothing. buffer-or-name must be a buffer or the name of an existing buffer.

delete-windows-on operates frame by frame. If a frame has several windows showing different buffers, then those showing buffer-or-name are removed, and the others expand to fill the space. If all windows in some frame are showing buffer-or-name (including the case where there is only one window), then the frame winds up with a single window showing another buffer chosen with other-buffer. See The Buffer List.

The argument frame controls which frames to operate on. This function does not use it in quite the same way as the other functions which scan all windows; specifically, the values t and nil have the opposite of their meanings in other functions. Here are the full details:

• If it is nil, operate on all frames.
• If it is t, operate on the selected frame.
• If it is visible, operate on all visible frames.
• If it is 0, operate on all visible or iconified frames.
• If it is a frame, operate on that frame.

This function always returns nil.