this.context = tc;
    }


    /**
     * Create an <tt>NtlmPasswordAuthentication</tt> object from a
     * domain, username, and password. Parameters that are <tt>null</tt>
     * will be substituted with <tt>jcifs.smb.client.domain</tt>,
     * <tt>jcifs.smb.client.username</tt>, <tt>jcifs.smb.client.password</tt>
     * property values.
     * 
     * @param tc
     *            context to use
     * @param domain