This assumes that the desired menu is currently enabled, however. If another application has "focus", the menu will belong to that application instead, requiring the user to check and see which menu is active before "throwing" the mouse, and often perform an extra step of focusing the desired application before using the menu, which is completely separate from the application it controls. The effectiveness of this technique is also reduced on larger screens or with low mouse acceleration curves, especially due to the time required to travel back to a target in the window after using the menu. On systems with multiple displays, the menu bar may either be displayed on a single "main" display, or on all connected displays. The classic Mac OS, and versions of macOS prior to OS X Mavericks displayed only a single menu bar on the main display; Mavericks added the option to show the bar on all displays.