wiring arduino to ir emitter and reciver

Hi all, i would like to wire the arduino to a couple of emitter and recive ir led like these:
Somebody know how to do it?
Maybe just like a led and a ldr?

Will need to know what they are besides what they look like. Any link to the part? The picture infers photo-transistors/IR leds

Here is the section you want to read up on: