Learning the code

Does anyone know how I can obtain the immobiliser code for a 620 i.e.? Guy I bought the bike from lost it.

I have red keys and black keys and the bike is fully functioning, but I would like to get the code - just in case.

Is there anyway I can learn the code form a fully enabled system? I.e. get the system to tell me what the code is when everything is working OK?

If not, is there any other way I can get a code, or, having the red key and taking into account everything is 100% OK, will I never need it?

Cheers