Como trabaja el Sistema de Plugins (Hooks o Lugar de Enganche) en vBulletin

//Mi Archivo.php que me muestra los usuarios en linea
$usar_postbit_legancy=$opciones_vbulletin['valor_configurado'];
llamar_a_hook('postbit_display_start'); //Hook
funcion_procesar_postbit();
llamar_a_hook('postbit_display_complete');  //Hook
imprimir_plantilla('postbit_template');

if ($usuario['grupo']=='Administrador')
{
$usar_postbit_legancy='LEGANCY';
}
else
{
$usar_postbit_legancy=$opciones_vbulletin['valor_configurado'];
}

//Mi Archivo.php que me muestra los usuarios en linea
$usar_postbit_legancy=$opciones_vbulletin['valor_configurado'];

if ($usuario['grupo']=='Administrador')
{
$usar_postbit_legancy='LEGANCY';
}
else
{
$usar_postbit_legancy=$opciones_vbulletin['valor_configurado'];
}  

funcion_procesar_postbit();
llamar_a_hook('postbit_display_complete');  //Hook
imprimir_plantilla('postbit_template');

$hook_query_fields = $hook_query_joins = '';
    ($hook = vBulletinHook::fetch_hook('showthread_query')) ? eval($hook) : false;

    $posts = $db->query_read("
        SELECT
            post.*, post.username AS postusername, post.ipaddress AS ip, IF(post.visible = 2, 1, 0) AS isdeleted,
            user.*, userfield.*, usertextfield.*,
            " . iif($forum['allowicons'], 'icon.title as icontitle, icon.iconpath,') . "
            " . iif($vbulletin->options['avatarenabled'], 'avatar.avatarpath, NOT ISNULL(customavatar.userid) AS hascustomavatar, customavatar.dateline AS avatardateline,customavatar.width AS avwidth,customavatar.height AS avheight,') . "
            " . ((can_moderate($thread['forumid'], 'canmoderateposts') OR can_moderate($thread['forumid'], 'candeleteposts')) ? 'spamlog.postid AS spamlog_postid,' : '') . "
            " . iif($deljoin, 'deletionlog.userid AS del_userid, deletionlog.username AS del_username, deletionlog.reason AS del_reason,') . "
            editlog.userid AS edit_userid, editlog.username AS edit_username, editlog.dateline AS edit_dateline,
            editlog.reason AS edit_reason, editlog.hashistory,
            postparsed.pagetext_html, postparsed.hasimages,
            sigparsed.signatureparsed, sigparsed.hasimages AS sighasimages,
            sigpic.userid AS sigpic, sigpic.dateline AS sigpicdateline, sigpic.width AS sigpicwidth, sigpic.height AS sigpicheight,
            IF(displaygroupid=0, user.usergroupid, displaygroupid) AS displaygroupid, infractiongroupid
            " . iif(!($permissions['genericpermissions'] & $vbulletin->bf_ugp_genericpermissions['canseehiddencustomfields']), $vbulletin->profilefield['hidden']) . "
            $hook_query_fields
        FROM " . TABLE_PREFIX . "post AS post
        LEFT JOIN " . TABLE_PREFIX . "user AS user ON(user.userid = post.userid)
        LEFT JOIN " . TABLE_PREFIX . "userfield AS userfield ON(userfield.userid = user.userid)
        LEFT JOIN " . TABLE_PREFIX . "usertextfield AS usertextfield ON(usertextfield.userid = user.userid)
        " . iif($forum['allowicons'], "LEFT JOIN " . TABLE_PREFIX . "icon AS icon ON(icon.iconid = post.iconid)") . "
        " . iif($vbulletin->options['avatarenabled'], "LEFT JOIN " . TABLE_PREFIX . "avatar AS avatar ON(avatar.avatarid = user.avatarid) LEFT JOIN " . TABLE_PREFIX . "customavatar AS customavatar ON(customavatar.userid = user.userid)") . "
        " . ((can_moderate($thread['forumid'], 'canmoderateposts') OR can_moderate($thread['forumid'], 'candeleteposts')) ? "LEFT JOIN " . TABLE_PREFIX . "spamlog AS spamlog ON(spamlog.postid = post.postid)" : '') . "
            $deljoin
        LEFT JOIN " . TABLE_PREFIX . "editlog AS editlog ON(editlog.postid = post.postid)
        LEFT JOIN " . TABLE_PREFIX . "postparsed AS postparsed ON(postparsed.postid = post.postid AND postparsed.styleid = " . intval(STYLEID) . " AND postparsed.languageid = " . intval(LANGUAGEID) . ")
        LEFT JOIN " . TABLE_PREFIX . "sigparsed AS sigparsed ON(sigparsed.userid = user.userid AND sigparsed.styleid = " . intval(STYLEID) . " AND sigparsed.languageid = " . intval(LANGUAGEID) . ")
        LEFT JOIN " . TABLE_PREFIX . "sigpic AS sigpic ON(sigpic.userid = post.userid)
            $hook_query_joins
        WHERE $postids
        ORDER BY post.dateline $postorder
    ");

($hook = vBulletinHook::fetch_hook('NOMBRE_HOOK')) ? eval($hook) : false;