Need help with sessions

I must be missing something here as I can not get this to work. I have a simple login script - if the login is successfull the user is forwarded to another page, if not he is returned to the login page. index.php has the form in it - when the user clicks submit it is sent to check.php for validation. In check php I have the following. if (!session_is_registered("logged")) { // This is the very first thing in check.php session_register("logged"); } .... more validation code..... if the validation is successful - $logged["logged_in"] is set to "True"; Now here is the problem - what do I put in main.php and other pages to verify that the user is actually logged in. I have tried many variations of conditional statements, but no matter what I put here I can't get it to recognize that $logged["logged_in"] is equal to "True". I hope I have explained this properly. Any help is appreciated.