On a huge monitor (or multiple monitors) it's quite a round trip (I pack a lunch) to move the mouse pointer from a window near the bottom of the screen all the way up to the top of the monitor to select something from a menu and all the way back down to the window.
I know I could move the window closer to the menu, but sometimes I have multiple windows arranged just so.
How can I have the menu appear at the top of the window as it does in at least a few other OS's or WM's?