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Most instance variables in Tapestry are automatically cleared at the end of each request. This is important, as it pertains to how Tapestry pages are shared, over time, by many users. Wiki Markup{

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However, you often want to store some data on a single page, and have access to it in later requests to that same page, without having to store it in a database between requests. (To store values across multiple pages, see Session Storage.)

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