People who use the computer are often simply known as "users".
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While I have no idea what a "delta person" is, I would expect them to use computers simply because just about anybody uses computers nowadays.
to note the name of people and rate of people
I think that the code that computers use to interchange information is called the ASCII code.
This is normally called a Protocol.
People use computers alot because there are zillions of things to do on them, and they're unlimited.