how to do this....

[nem]

you know with a log in and regoistration script, how can you stop a guest from accessing certain areas? Like the forums for example, or stop them from using a shoutbox? Maybe downloads?

Can someone please explain?

From what i seen, they are just scripts to forward someone, but how can you stop a guest from visiting a certain url?

[sfullman]

You sound new, here's an overview:

Page 1:

<?php
session_start();
if($someCondition==true){
    $_SESSION[loggedIn]=true;
}
?>

Page 2:

<?php
session_start();
if($_SESSION[loggedIn]=true){
    include('supersecretpage.php');
}else{
    header('Location: login.php');
    exit('You are not logged in');
}
?>

You need to read up on sessions and session variables in the php manual, this is the best way to go