Thanks for your reply, I try to explain better again
a) From my home site I want an access that connect a repository ( in my case I have DropBpox as this )
b) As client I can visit websites of second hand products and If I have interesting for a car, and this car car was certified and tested for my company fredverifica, this cliente can give and ID and I can go to Fredverifica Home site and locate the documentation about this car certification
c) So the ID of the inform will be unique
Nothing more, I hope that now you can understand this
Regards,
PD: I said that is better Spanish developer because my website is in Spanish only for the moment, and is more easy to understand if you speak Spanish