JSF中关于javax.faces.STATE_SAVING_METHOD的一个问题?

看<JSF in Action>里讲JSF的生命周期时,有下面一段:
A view represents all of the components that make up a particular page. It can be
stored on the client (usually in a hidden field on a browser) or on the server (usu-
ally in the session).

意思是说:"在JSF中,一个视图代表着组成整个特定页面的组件,它可以被存储在客户端(通常以隐藏域的方式存在浏览器中),也可以存储到服务器上(通常以Session的方式.)"


存放在服务器上的情况先不考虑,对存放到client端的方法有些疑问,我看了下生成HTML的代码,其中是有一个element,它的内容如下:
    <input type="hidden" name="javax.faces.ViewState" id="javax.faces.ViewState" value="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/>

看的很晕.

web.xml中相关的配置为:
  <context-param>
    <description>State saving method: "client" or "server" (= default)
            See JSF Specification 2.5.3</description>
    <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
    <param-value>client</param-value>
  </context-param>

我怀疑这就是上面所说的"以隐藏域的方式存到浏览器上"的表现.

不过,我的疑问是:
    1,先不说这个hidden variable有这么大,即使很小,那它有什么用?在提交时再传回Server上,还原出以前的状态么?
    2,在什么情况下要用这个?与存在Server端比有什么优缺点?