I found a way to control my Denon 3808ci anywhere in my house without needing to get the Denon RF remote.
My iPod Touch can control it!
As long as it's connected to my home WiFi I have complete control over my receiver!
I saved the Denon web controller as an icon on the main page of my iPod & when I click it it goes to the web controller.
From that page I can go to all the control pages for the Denon.
Denon has an online capability that allows it to be controlled not just by a iPod but your PDA or any smart phone that has WiFi internet.
I don't know what other equipment has an online interface but this may be an inexpensive way to control you equipment if you do not have line of sight or RF.