Programming additional keys

[corindm]

Hi,

I'm sure this has been discussed lots before but can't find it!

I'm looking to buy an additional key for my A3, i've found various instructions online on how to program them. Does anyone know if there is another process for programming the tranponder/immobiliser or is this covered in the coding procedure? http://www.audipages.com/Tech_Articles/Body/remotecoding.html