Put simply, it's a basic feature of all machines that have TCP/IP installed. 127.0.0.1 is your machine. It's mine too IF I have TCP/IP installed.
For a long time, I thought that when I issue the PING 127.0.0.1 command, the modem or the COM port would reply.
However, if I remove the modem and disable the COM ports, I still receive a reply. What device\software is replying to the command?
Any word or two about will be appreciate.