Prentke Romich Company
http://www.prentrom.com/support/article/1757
Off-Screen Pause Key
Default is On.
When this is On, you can gaze at the area immediately below the round camera circle on the front of your case until PAUSE or RESUME is selected. You will see “Pause” or “Resume” on your display screen.

Tip! If Eye Track Status is turned on and Track Status Size set to small, you will be able to tell if the unit is set to Pause or Resume by checking the box in the upper right and determining the color of the box. If the box is red, the eyegaze is paused. If the box is green, the eyegaze is active.
Off-Screen Tools Key
Default is On.
When this is On, if you gaze at the left side of your display screen, the TOOLS menu will appear.