FormClientPersistence

 refference:http://wiki.apache.org/tapestry/FormClientPersistence.

I can't understand what can we profit from the FormClientPersistence.for the PageLink, DirectLink, or ExternalLink ,it will not encoding the data to URL ,but for the post,it will only
encoding the form data to the url.is that right?

do we need to explicitly put the @Persist("client:form") in the code?or where do it put?