Another general question now I've managed to do 2 stereo's and a GID I'm getting the hang of it.

Question is, I read a GID and a CD30 MP3 off of a Corsa D, and got the same security code, including the correct vin number from the GID, The code I'm getting say's security code, but is the key number and radio code different? Just I see from reference car pass photo's that the key and radio code is never the same as the security code, are these two codes needed and for what and can you retrieve them if they are needed? I was assuming that you could retrieve the code for the stereo at least, just checking what you can and can't do, and what is and isn't needed.

Also some car passes mention an immobiliser code? is this needed and if so for what?

Thanks for any input