How does Seam store conversation state in the client browser?

Seam's documentation says that conversational state - see link last line - can be configured to be stored in the client browser as opposed to the servlet session. Can anyone tell me:

1. How is this configuration set?
2. How does Seam actually internally store the conversational state in the browser?

Dan Allen, Author of Seam in Action book and red hat Seam core developer, states

Since conversations are stored in the session, two requirements must be met:

• Conversation-scoped components must implement java.io.Serializable.
• The session timeout, defined in web.xml, must exceed all conversation timeouts.

As far as i know is that The JSF Tree can be stored in The client side, enabled through web.xml context param

<context-param>
    <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
    <param-value>client</param-value>
</context-param>

But keep in mind bandwidth issues when using this kind of configuration