If you are ever in a Hotel and want to connect a device via HDMI to the flat screen LCD or Plasma you are normally out of luck as the Hotel locks down the TV so that you cannot change anything. They usually do this so that you cannot get round their pay-per-view channels etc. They also replace the normal remote with another remote with limited buttons and options. When you try to change to one of the AV inputs on the set you are normally greeted with an menu disabled warning or something similar.
There is a way around this though.