(Everyone should have heard of the word "remote control", that is, the technology that one computer (the remote/ client of the master control end) can control another computer (the host/ server of the controlled end) from a long distance on the network. Remote control has many uses. You can sit at home and manipulate the computer in the office for remote work. You can use remote control to help friends in different places solve computer problems, which is much more intuitive than using telephone command.)