session_start() part II

ok, let's have this in the right place in a file named startsesion.php i.e. session_start(); session_name("mysesion"); session_register("myvar"); $myvar = "whatever"; a SID is generated autmaticaly I've been trying to echo the values of the var defined and the SID generated in another php file <?php echo ($sesionvar); ?> not working <?php echo ($HTTP_SESSION_VARS["myvar"] ); ?> not working <?php echo ($GLOBALS[$sesionvar]); ?> not working <?php echo session_name(); ?> not working <?php echo ($PHPSESSID); ?> not working how can I get this values? thanks, gracias