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=item Digest::MD5

This module is used to generate unique cache keys. If you don't have it,
then keys will be computed with a checksum that has a very low but not
infinitesimal chance of causing a cache conflict.

=item Storable

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

=item Safe::Hole

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

=item DBI

Most people want to use SQL with Interchange, and this is a requirement.
You will also need the appropriate DBD module, i.e. DBD::mysql to support