Oh, forgot to mention anything about remote controlling your PC.

You could try a bluetooth keyboard and mouse, but I would be surprised if the range was sufficient.

Otherwise, you can get infrared keyboards with an integrated trackpad/joystick thing, but that would require you to run a serial cable from the PC into the lounge so you can see the infra-red receiver.

If you have a laptop and a wireless network, you can run a utility called a VNC server on your desktop PC and a VNC client on the laptop and use this to remote control the PC from the laptop. VNC is free and easily found on the web.