IR receiver. I spoke to a Pioneer engineer who
stated that they are working on this capability.
They have been saying that for years. Honestly, IR pass through should be a mandatory requirement for all plasma TV's, that along with a full set of discrete IR codes available for download on each manufacturers web site in full pronto hex. Better yet, they should all do what Request audio is doing. They have full turnkey discretes available for download on their site for just about every programmable remote on the planet.