I observed with several electronic devices (primarily romote controls) which use infrared light emitting diodes (IR-LEDs) to send data is that with some, if the LED is viewed closely and carefully enough you can see a red light flash when being used. I know that IR light is invisible, and I'm not looking at it through a video camera or some special optical device, so I assume that the fact that I can actually see a tiny light must be based on the fact that the LED isn't perfect and therefore, some visible light is emitted along with the infrared light. And now that I think about it, the fact that the light looks red is understandable as infrared is just below the red light of the visible spectrum. Anyway, the thing about IR-LED's is that the light coming from them looks rather fuzzy, like it's flashing on and off quickly. I have an iPaq Pocket PC (H3800 series) that has infrared data transfer capabilities. And when it's transfering data via IR it periodically lights up a fuzzy red for about a second and then stops for about a second. The process is repeated over and over again. My question concerns this flashing (on/off) mechanism. I know that all information in a computer is in the form of the pulse (1) and absence (0) of electrical discharges, which represent binary digits (zeros - ones). And the binary digits are grouped into "bits" of information (16 bit, 32 bit etc) to represent ASCII (American Standard Code of Information Interchange) characters which make commands to the hardware. I read a while back about processor types and speeds of PDAs (Personal Digital Assistance). Of course, the processor of a handheld device is less sophisticated and cutdown but still similiar. The processor type installed in my Pocket PC is an ARMStrong, which is 206MHZ. Processing speed is measured in "clock cycles." So put in another way, a light flashes so many times within a second to send whatever quantity of bits of information, and after the second is up it pauses and then initiates another packet transfer (repeats the process)? Microprocessors have timers inside them. So the on and off correspond with the 1 and 0 binary digits. And megahertz (MHZ) must be a measurement of how fast the processor can read within a second? If this is correct then it means that my Pocket PC can read 206 million binary digits in one second?