Mostly, it is the result of poor computer security. For minimal security you should ensure you have up-to-date anti-virus software installed on your computer as well as a firewall. It's also a good idea to ensure that any WiFi network in your home or business is password protected.
Ports, and software.
They have special software for that which allows to connect to your computer and do what ever they want.
Do you mean remote control OF a computer? That means that a program has been installed on a computer (computer A) that lets someone on another computer somewhere else (Computer B) control the computer instead of the owner/user. The remote person on Computer B can move the mouse, click links, open files, etc as if they were physically sitting in front of Computer A themselves. Computer technicians, working with customers over the phone, will sometimes use this as a tool the help fix the computer, especially with clients that don't understand computers well enough to follow the techs instructions. Hackers can use this to steal info on a computer from a distance. If you meant what you said... remote control computer... I don't really know without a better description. Maybe it is the computer doing the controlling?
"Remore Access" must be enabled on the computer to be controlled.
Users can communicate to their computer using the keyboard. Another device that can be used to communicate to a computer is the mouse.
UltraVNC software allows a user to control their computer from another computer anywhere as if they were at their own machine. It requires the internet or a network to do this.
Remote.
Control panel.
Logmein software allows companies and individuals the opportunity to access and control a computer form another location. This allows the sharing of information, documents, and help in real time.
It generally refers to controlling a computer from another computer or device. An example would be the app I have on my iPhone that allows me to control and view my home PC from anywhere that I can connect to wifi. It is used often for remote assistance with computer problems.
the control panel
The Administrator.