how does computer send data through serial port?
Neither. A computer case is just a box to hold the parts of a computer. It provides no form of communication itself.
No, there is not any command since the serial number of the computer is decided by the computer manufacturer. Edit: Sure there is. cmd-> "wmic bios get serialnumber"
Go to selfsolve.apple.com. Type in your computer's serial no. (it tells you how) and it will tell you your year and computer type.
It is not necessary to power down the computer to hook up a serial device. It is also not necessary to power down a serial device before hooking it up to a computer.
That means that you're using a USB to Serial adapter like this: http://sewelldirect.com/usbtoserial.asp Prolific is one of the companies that makes USB to Serial chipsets, and when you are using one of their adapters it will show up on your computer like that. Many newer computer do not have serial ports on them so you need a USB to Serial adapter to be able to use serial devices with your computer. If you have a laptop and you're using a docking station then it might have a USB to Serial adapter inside of it which is using the Prolific chipset.
com1,com2 com3
Universal Serial Bus
A serial code in The Sims 3 is what you require to install the game which means no serial code is equal to no Sims 3 on your computer.
USB stands for Universal Serial Bus and is a standard means for connecting devices such as flash memory, printers, cameras etc. to a computer.
iStealer is a program that will steal passwords/serial numbers from your computer.
COM means then Serial Port.