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required. See their PODs for full documentation, and see the supplied
extensions for lots of examples.

=item * Personal Preference Setting

As well as allowing for site-wide enhancements to be made in
Wrapper.pm, a hook is also provided for individual users to set their
own defaults.  If the file C<~/.clearcase_profile.pl> exists it will be
read before launching any of the sitewide enhancements. Note that this
file is passed to the Perl interpreter and thus has access to the full
array of Perl syntax. This mechanism is powerful but the corollary is
that users must be experienced with both ClearCase and Perl, and to
some degree with the ClearCase::Wrapper module, to use it. Here's an
example:
 
    % cat ~/.clearcase_profile.pl
    require ClearCase::Argv;
    Argv->dbglevel(1);
    ClearCase::Argv->ipc(2);

The purpose of the above is to turn on ClearCase::Argv "IPC mode"