How to buildt dinamicly a controller?

[eluser]Peter74[/eluser]
Hi all, iam building a site where the customers can show them products, i whish to show a url like this www.thedomain/customersite1 to www.thedomain/customersiteN but not from code
(i hope a lot of customers suscriptions xD), i dont know if iam thinking the good way, maybe u can help with something to start.

Very txs in advance

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sry about my poor inglish