Authentication only with a "Bonus-Code"

[Lakesider]

Hi NG,

a very simple question, but I do not found a good answer:

I create a website with a default.aspx site. There you can insert a
"bonus-code", eg "1234abc". If you have a correct bonus-code according
to a database table, you are redirected to the folder /Bonus/, to
website bonus.aspx.

I don`t want to use user accounts, just simply say "this actual user
is authenticated and can use /Bonus/bonus.aspx"

How can I do this?

Thank you very much,

Rudi