weburl to record via iwp

Is it possible to create a calculated url that links to a record in a
shared database via iwp?

I am trying to create a solution where I send out reservations via
email, and in the email I want to have a url that the reciever can
click on and wil open a webpge with the record via iwp.
The url should contain a random key, that I will use as a relationkey
on the layout where the client can se the reservationinformation in the
related portal.

How should a iwp url that points to a database and a spesific record look like?

Nicolay