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AID is used to uniquely identify your application on the card. It has two components:
RID is issued by ISO and the companies need to obtain a unique RID from ISO. RID should have length of 5-bytes while PIX is propriety to every companies and it is also an optional part of the AID. It's length various from 0-11bytes. Now if you are using AID for learning purpose than you don;t need to have RID assigned by ISO, you can use any (hex) value within range of 5-16 bytes as your applet'/package' AID.
I wonder, because the system is used for in-house book-keeping purposes. It has nothing to do with the outside world. Is it safe to ignore any iso assigned id, and continuously use the casual 'id' that I give to it?
AID's are defined in ISO7816-4. The first nibble will tell you what kind of AID it is. If you have an in house applet you can use F for the first nibble and what ever you want after that.
'F' Proprietary No registration of application providers- Shane