Hello,
While the computer is connected to internet which types of data is or number code goes through it for identifying the PC .
like IP address is there is something more?
and how to edit PC IP is it stored in ROM?
MAC Address is hardcoded, it cannot be changed.
A MAC address is represented in double digit Hexadecimal code, for example, 0a:1b:2c:3d:4e:5f.
The first three digits are manufacturer fixed, the remaining, they vary from device to device.
If MAC address were to be same for two devices, then there will be no way to uniquely distinguish them.