PC to PC USB communication

Question

How can I communicate between two PC\'s via USB? I want a program to send numbers trough the USB port to another PC on which another program would show these numbers. I have

Answer 1

I can't find a way to make one PC a device. So is it even possible?

No, this is not possible on a PC. USB communicates always Host->Device, and PC is always Host. You can buy a special USB2USB cable, this has a chip in the middle that communicates as device on both ends.

But I would just use a LAN cable. Every PC I know comes with Ethernet these days. TCP/IP is not too hard to use.