Users may control the placement and size of all windows. To alter a window, one places the cursor in it and invokes a menu by either clicking M on the mouse or simulating the mouse actions with the keypad in the following fashion. First, one enters mouse mode by pressing the MOUSE MOUSE }key (see figure ). Next, using the arrow keys and, optionally, the LONG LONG } key, the user positions the mouse in the desired window and presses MOUSE again, thereby causing a menu of operations to appear. The option desired is selected by positioning the cursor next to the option in the displayed menu and pressing the MOUSE key; when a menu item is selected an asterisk appears on the left of the item. To leave mouse mode one uses the DIAG DIAG }key. In subsequent discussion, the commands described are mouse commands rather than keypad commands. The translation to keypad commands is exactly as described in the discussion above.
The basic window manipulating commands available in the menu are size and move . The position of a window is determined by its upper left corner and the size by its lower right corner. To change position, for example, one selects the move option in the menu (by placing the cursor on it and clicking M) and then positions the cursor at the new location for the upper left corner and exits mouse mode by clicking M. Similarly, the size of the window can also be altered. Windows are closed by holding down the control key and pressing D. (The notation is used to represent this key combination.) When a window is closed the cursor returns to the window it had been in when the new window was opened. Several other window management commands are available in mouse mode; these commands are typically needed when the user has several edit windows in use concurrently and needs to hide some of them temporarily. A complete discussion of these commands appears in chapter 7.