How do use hdmi cable?

Hdmi cable is used to connect the computer and the TV. That is, the computer's video and audio into a digital signal is played out through the TV. Television became the equivalent of a large LCD display. We usually use this feature to download the movie to see, as well as broadcast did not have time to watch some of the TV programs.
mini HDMI cable seems to be independent of the set-top box. STB has its own audio and video cable with TV.
If you use an hdmi extension cable  you can not control the computer with the TV remote control. Starting a computer mouse or keyboard control, we bought a wireless mouse and keyboard, you can control the computer on the couch.
Note that the Hdmi cable connection, select the connection mode using the remote control is HDMI mode, not PC mode.