I am very interested how it is possible that my raspbmc is accepting signals from the remote of my Sony TV. I hope you don't misunderstand me.
Everything works fine!
But i want to know with which technique it's possible to control raspbmc via remote because it's connected to the TV only by an HDMI-cable.
This is called CEC. It runs over pin13 of the HDMI connector
Consumer Electronics Control (CEC) is an HDMI feature designed to allow the user to command and control up-to 15 CEC-enabled devices, that are connected through HDMI
It can work in both directions. raspbmc can also turn the TV on and make itself the active source