[ic] 2 cart with one userdb

[Kevin Walsh]

> 
> I'd like to share a unique userdb table for two carts.
> Does anyone know how to make it?
>
Each user can save as many "carts" as they like in their
userdb record.  See the [userdb] tag docs.

For instance [userdb function="set_cart" nickname="foo"]
will save the current cart contents using "foo" as the
key.  [userdb function="get_cart" nickname="foo"] will
retrieve the user's cart contents, identified by "foo".

There are other [userdb] facilities as well.

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