(Let me answer your first question: how to interconnect two computers. If you just want to transfer the files of one computer to the other, then you need to set the IP address 192.168.1.1 on one of the computers (such as desktop computers), the gateway is set to 192.168.1.1, the subnet mask The IP code is set to 255.255.255.0, and the IP of another computer (such as a laptop) is set to 192.168.1.2)