Yes it is possible to store data in the client side on hidden fields. If you are using ASP.NET you can use the ViewState (also hidden field implementation) to store any serialized .NET objects.
You can also save your data on javascript object and then forward them to server using XML or JSON.
If you want more information you can ask me anything on my blog: http://caught-in-a-web.blogspot.com/
Hope it helps,
Rotem
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