For, If are volatile?

[XYZ]

When For and If are inside a Form, they generate many hidden fields.   
What are they for?I notice that getVolatile is used inside  
evaluateCondition() of IfBean.  But I do not yet see the side effects  
of setting volatile="true" when using the If and For inside a form  
(except that much less html is generated).  Can somebody explain what  
are the side effects? Thank you.

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