Excel Terminology

An Accelerator key is a keyboard method allowing the user to operate the Ribbon and the Context Menu by using keys allocated to each item.

In the Ribbon, the Accelerators are displayed next to the ribbon Tabs when one of the Ribbon activation keys is pressed - Alt, F10 or / (slash).  On pressing an Accelerator next to a ribbon tab, that tab is opened and Accelerators appear next to the commands and lists in the Ribbon.

In a Context Menu, the commands and sub menus have an underlined letter in the text of each option.  Pressing this letter activates the command or opens the sub-menu.

Add or Remove Selection Mode is activated when pointing in a reference either the Shift+F8 Extend Selection shortcut is pressed..  While in Add or Remove Selection Mode, the active cell can be moved to a cell, and then the selection mode keystrokes can be used to Add a new range area to the selection, or if the cells selected are already in the selected range, they are removed..  [click the link to see a screenshot of the Extend Selection Mode flag]