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The Netscape Browser can store information in fields on the client side. The browser stores this information in a text file in the browswer directory and can thus provide "persistant" cookies: the information can be saved over many browser invocations, as well as transactions.
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Basically, the browser sets up a cookie whenever it receives a "Set-Cookie" header from a server, and it will pass back information in the "HTTP_COOKIE" environment variable whenever the user requests a document that fits the validity parameters of the Set-Cookie header.
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More general than hidden fields but currently only works on netscape browsers, work is being done on a general standard for HTTP state-info mechanism.
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Current cookie specification is at URL:
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http://home.netscape.com/newsref/std/cookie_spec.html
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