On 10/13/2009 10:23 AM, Invisible wrote:

> scheme is utterly unrelated to any of the others. God only knows how
> this is physically possible...

usually using a diode laser, a rotating mirror and a photo sensor, which 
turns photons into electrons, where the circuitry then interprets the 
variations of electron flow into digital signals, which is then 
processed by a processor, running software that can interpret the 
encoding schemes of many different types of barcodes. It then sends 
signals (either by RS-232 or USB protocol) to the computer, a device 
driver reads the incoming signal, and interprets the signals as a series 
of characters, output to the desired application.
-- 
~Mike

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