phantasy star online ver. 2 how to change cdkey

[iversonis]

You know when you run this game for the first time on DC it asks for a serial (cdkey).
Do you know how to change the cdkey, if you wish to put a different one in?

Looks like this permanantly records the cdkey into your Dreamcast machine!! Crazy!!

Please help if anyone knows how.

Thanks.

[Infinity_Engine]

When you go online it'll ask you to enter a cd key again if i'm not mistaken