Problem with session management - How to destroy a session

Hi, First of all, I'm using PHP 4.03pl on a WIN 2000 running IIS 5.0. PHP is plugged in as ISAPI. I've got an active session that I want to destroy. When I make session_destroy(), I get the following : Warning: Session object destruction failed in D:\xxx\menu.php on line 7 I checked if the session was active. Here's my PHP code : (at the top of a PHP page, the session is created in another page) <? session_start(); if(session_is_registered("ID")) { echo "La session existe et ID =$ID"; // session_unregister("ID"); // session_unregister("LOGIN"); session_destroy(); echo "<br>"; } ?> and here's what I get at running time : La session existe et ID =154 Warning: Session object destruction failed in D:\Sites WEB\ESCNA\Php\CVtheque\menu.php on line 7 (I got the same with the above commented lines, uncommented). I don't understand what happens. Any suggestions will be greatly welcome. Thanks Stéphane PS : I also try to open a session and to close it in a separate specific file with <? session_destroy(); ?> at the top of the file. I got the following warning : Warning: Trying to destroy uninitialized session in D:\xxx\essai.php on line 1 Stéphane Cesbron Chargé du développement Internet/Intranet AUDENCIA - Nantes.Ecole de Management 8 route de la Jonelière B.P. 31222 44312 Nantes Cedex 3 Tél : 02.40.37.34.47 http ://www.audencia.com