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=head1 SYNOPSIS

  use NIS::DBM;

=head1 DESCRIPTION

NIS::DBM trivializes the implementation of daemons and other scripts
which maintain the NIS databases by presenting them as a hash keyed by
both username and user id.  If a numeric username exists in the byname
databases, the number associated with that username will be used as the
user id.  This is the same behavior as B<chown> and B<chgrp>.

NIS::DBM maintains three caches of information to construct an accurate
view of the NIS databases as modified by the program.  The caches are
for actual records from the database, modifications to the database, and 
deletions from the database.  The caches have the following precedence: 
deletions, modifications, and general cache.  The caches may be flushed to 
the database files at any time or upon object destruction.

=head1 NIS::DBM API