Форум

<?php 
$_SERVER["DOCUMENT_ROOT"] = "/home/bitrix/www"; 
$DOCUMENT_ROOT = $_SERVER["DOCUMENT_ROOT"]; 
define("NO_KEEP_STATISTIC", true); 
define("NOT_CHECK_PERMISSIONS", true); 
set_time_limit(0); 
define("LANG", "ru"); 
require($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_before.php"); 

//ваш код... 

require($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/epilog_after.php");