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then keys will be computed with a checksum that has a very low but not
infinitesimal chance of causing a cache conflict.

=item Bundle::LWP
Certain parts of these modules (URI::URL and MIME::Base64) are required
for Interchange's internal HTTP server. Also, Business::UPS, for calculating
shipping, requires this.

=item Storable
If you have this module session save speed increases by anywhere from 25-60%.
Highly recommended for busy systems. 

=item Business::UPS
Enables lookup of shipping costs directly from www.ups.com.

=item SQL::Statement
Enables SQL-style search query statements for Interchange.

=item Safe::Hole
This helps Interchange deal with the object-creation restrictions
of I<Safe.pm>, used to encourage security.