Hello forum!

I want to do the following

Control my HTPC
Control my TV
Control my Marantz 5300 receiver
Control my Sony CD Player
Control my Pioneer DVD-454 player.
Control my projector?

All this via one device! Is it possible?

How would i go about setting this up?

I have been reading the forum, but most posts are very product specific. I basically need to understand the the fundamentals so I have a platform for choosing my equipment.

Thanks