Allena help file or support webpage shows how the following terms are used to describe mouse actions and keyboard functions:

Mouse Actions

Click – Press and release the left mouse button. Double click – Click the left mouse button twice. Right click – Press and release the right mouse button. Check a box Move the mouse pointer over a check box and click it to activate or deactivate it. Turn on a box by putting a check in it.

Keyboard Functions

<Tab> Move the focus of the cursor to the next available control. <Enter> Moves the focus of the cursor to the next available control or commits a transaction. <Delete> Remove selected data from fields and some datasheets. <ESC> Stops a function.