Question: how doesit work?when we type A in keyboard  , then the alphabet A appear in your screen? i mean how computer work..its really wonderful..

Answer: When you press the key down, an electrical circuit is completed, which sends an ASCII or HEX symbol back to the computer, which interprets it as a specific number or letter.\n\nSome computer viruses can mix these signals up, and replace the key A, with the ASCII symbol for hte letter O for example.. So everytime the person presses A, the letter O shows up.
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