No -- It looks as though that company just produces pen "tablets" which are presumably some sort of touch-sensitive device.
I'm talking about the light pen which you actually touch directly onto the CRT screen.
Trumpy,
The pen is basically just a photo-diode and lens assembly which is used to detect the beam as it scans the face of the tube. At the instant the beam is detected on its scan, the system just checks the current X and Y coordinates from the video circuitry and you therefore have a precise indication of where the pen is on the screen.
