on the same page that you posted for us, further down is this text:

-- The Trigger UI --
The trigger UI is a bunch of nurbs surfaces parented to the camera - these surfaces are the triggers for selecting the character controls. When you select a trigger the corresponding puppet control is selected on the character. You can move and scale the trigger icons by clicking the x's. The transparency of the icons can be set on the centre of gravity control (cog_ctrl). If you don't like them you can switch them off completely in the layer bar.

To switch the UI to a different perspective camera create a shortcut with the following command:

asSwitchUICam;

Make sure the correct scripts are installed for the Trigger Interface to work.

If you would like to create your own triggers you can do so with the trigger script. Use the following command as a shelf button, hotkey or type the command in the command line:

zooTriggered;

after that you're either on your own or i hand you over to the mel scripting gods on this site