The border exists because computers of the 8- and 16-bit era typically did not or could not display an image across the entire screen.

Measurements are made by monitoring the current as the tip's position scans across the surface, which can then be used to display an image.

The company decides which sites to use and controls how these sites display their image.

The software displayed this image on a screen.

The central control computer analyzes this information, including sending the compressed television imagery signals to imagery computer, which in turn, convert the information to display the image on the screen.