Instead of an SAP icon button, you can use a keyboard shortcut. A keyboard shortcut is a key or combination of keys that you can use to access icon button functions while you are working in SAP. On a PC, the icon name and keyboard shortcut are displayed when you place the mouse over the icon.
Note: Keyboard shortcuts may be different for the same icon depending upon the SAP screen you are in.
MAC Note: The Mac does not display keyboard shortcuts, but the keys function the same as on a PC. On some Macintosh computers, when you try to use the Function keys, a dialogue box may appear saying that your Function keys need to be set up in SAP. To enable your Function keys, check the option not to display this message again.
Courtesy : POTools