Adder Technology AVM208MP - Manual (Page 49)

AdderView MATRIX MP Installation and Use Page 48
To connect to a computer, place the menu bar over the computer name using a
combination of the up and down cursor keys and the page up / page down keys.
You may also use the wheel on a wheel mouse to move the menu bar up and down
if you have enabled mouse control (see section 3.6.8).