The window identifer, an integer ranging from 1 to the number of active windows. The maximum number of windows is 16.
If there is no argument, this command deletes the active window. If a window id is given as an argument, This command deletes the window identified by window_id . In either case, there must be at least one visualization window remaining after the deletion. Otherwise, the window is not deleted.
Note that windows remaining after a deletion are not renumbered. So if you had 5 windows open, and you deleted windows 3 and 4, you would be left with windows 1, 2, and 5.
If you delete the active window, the lowest numbered window becomes the new active window.