We are sending out a group of emails that will have an id attached
ie 3453abc56, which will be our reference for this customer.
so we send an email which has a link on the page abc.com/testdata.html?tpages=3453abc56
as an example, what is the best way to store id into the site, so that were ever page they go to we would be able to use this value for a questionare that we have attached on the site and would allow us to identify the client
and how would you do it please