How to use the rednet protocol

Hi Guys,

I was wondering how to use the rednet protocol and i don't know how to use it

- House

I think it may be useful for not to process large quantities of messages, searching for the message the program needs.
Also, it's useful if you want to have various computers wich sends the same message to the central one and needs a response. The central computer may need to recall a function based on the message, and to send it to the computer defined in the portocol (or vice versa). I feel that like a second message into one (message-ception :ph34r:/> ), even if I know it isn't exactly like this. I'm not informed this much :P/>
There it is some documentation:

Spoiler

rednet.send(), with some specific explaination - http://www.computercraft.info/wiki/Rednet.send
rednet.lookup(), a function specific for protocols - http://www.computercraft.info/wiki/Rednet.lookup
rednet.host() - http://www.computercraft.info/wiki/Rednet.host

Direwolf20 made a simple explanation on how the protocol part of rednet works on his CC 1.6 spotlight video.
https://youtu.be/S731LoSHYXw