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To fully understand the system that has been developed, this section will cover what happens from initial setup to usage from a user perspective.  Firstly, the phidget program must be executed. After this, the full hardware kit contains 3 USB powered devices. All of these must be plugged in in order to proceed with application usage usage. When all devices have been plugged in, a short delay allows the user to switch to Google Earth and allow the system to fully take control of the system.  When Google earth has been focused and the system has booted completely, the hardware can be used immediately. Firstly, the user will likely want to zoom in to see a closer view of the planet and satellite imagery. To do this, the user would push the slider forward which would emulate a key press on the keyboard and would zoom the view in. To do the opposite, the user can pull the slider back and similarly, the view would zoom out. To stop zooming, the user would place the slider bar somewhere in the middle of the range of motion. This is outside the thresholds and causes no action, and further allows other phidgets access to the system.  The next action a user may want to perform is to navigate around the map in a similar way to using arrow keys. This has been implemented in our system using the circular phidget.