<P> Keyboard shortcuts could be accessed by pressing the "right Amiga" key along with a normal alphanumeric key . (Some early keyboards had a Commodore key to the left of the spacebar instead of a "left - Amiga" key .) The filled - in and hollowed - out designs, respectively, of the left - and right - Amiga (or Commodore and Amiga) keys are similar to the closed - Apple and open - Apple keys of Apple II keyboards . </P> <P> The NeXTstep OS for the NeXT machines would display a "menu palette", by default at the top left of the screen . Clicking on the entries in the menu list would display submenus of the commands in the menu . The contents of the menu change depending on whether the user is "in" the Workspace Manager or an application . The menus and the sub-menus can easily be torn off and moved around the screen as individual palette windows . </P> <P> Power users would often switch off the always - on menu, leaving it to be displayed at the mouse pointer's location when the right mouse button was pressed . The same implementation is used by GNUstep and conforming apps, though applications written for the host operating system or another toolkit will use the menu scheme appropriate to that OS or toolkit . </P> <P> The TOS operating system for the Atari ST would display menu bars at the top of the screen like Mac OS . Rather than being' pulled - down' by holding the mouse button, the menu would appear as soon as the pointer was over its heading . This was done to get around an Apple patent on pull - down menus . </P>

What is the function of menu bar in microsoft excel