> How can I set a variable that is available to all page
> requests until I unset it?

You have these options:

- Use an nsv.  http://aolserver.com/docs/nsv.adp

- Use ns_share.  This is deprecated.

- Define a proc that returns the value.  This is only useful for
constants, and you must know the value at startup time.

- Use the ns_cache module.
http://www.arsdigita.com/acs-repository/download-verify?version_id=622

Sounds like the ns_cache module might be the most appropriate for you.

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