[Seaside] Registration e-mail verification

[David Buck]

I want to implement a mechanism where someone can register for an 
account on a Seaside web site by providing an e-mail address.  In order 
for the registration to be completed, Seaside will send them an e-mail 
containing a link which they have to click on to return to the web site 
to continue the registration process.

Sending the e-mail isn't a problem.  How can I generate the URL in 
advance to put into the e-mail that the user can click on to complete 
the registration process?

Thanks
David Buck