What is the process you guys go through to give people these discrete codes?

I've got the IREdit program, along with the decode ir dll and also the makehex program.

I understand to decode an IR you paste into IREdit, it gives you the Protocol, Device and OBC (function code), also EFC value that I don't need for the remotes I program.

I thought that once IREdit decoded the IR Hex codes, that you could then change the command value and hit Encode IR, this doesn't work for me, the Hex code stays the same??

Also is the a list of what the function codes are? Do all companies use a predefined list, or is always different and you just have to test them all?

Would love to know how you guys do it, mainly to save you guys doing it all the time?

Thanks in advance!!!!!!!!