Hi Chris, Chris Withers wrote at 2003-5-22 15:53 +0100:

What is a 'Temporary Folder'?

A folder that goes away when Zope exists. It is temporary in the sense that it is not persistent and dies when the Zope process stops.

How does it relate to a 'Session Data Container'?

The "Session Data Container" is (by default) placed in a Temporary Folder.

What happens if you instantiate a 'Session Data Container' in a normal folder?

Then the session info survives, in principle, a Zope restart. As the "Session Data Container" (usually) implements expiration timeouts, sessions will be invalidated when the are not accessed recently (e.g. because Zope was dead for some time).

Are previous revisions for objects kept in memory or on disk for information stores in a TF

Temporary Storage (the ZODB storage used by Temporary Folder) maintains one previous revision in memory (to support limited conflict resolution).

or SDC?

The "Session Data Container" does not maintain previous revisions.

Can you use either of these to store a mapping where you want key/value pairs to expire after a certain amount of time?

I think, a Session Data Container will do this happily...

If so, how would you do so?

Straight forward ;-) Dieter