Keys which, when pressed in combination, give fast access to a command. Control+s for "save" is an example. If you type "shortcut keys" or "keys" into a help menu, you will often be given a useful list.
A keyboard key sequence used to activate a menu item, usually through a special accelerator key. For example: Press Alt+F to choose Print from the File menu.
A keyboard key sequence used to activate a menu command. This can be a key sequence that uses a special accelerator key, or an underlined letter (mnemonic) sequence. For example: Press Alt+F4 or Alt+F+P to choose the command File xde Print.