I did call session_start() before anything is output to the browser.
http://www.php.net/manual/en/function.session-start.php

I only have one php file so I know I'm recyling my code each time:

session_name("TestALS");
session_start();

session_register("studentid");
if (isset($_SESSION["studentid"]))
{
$id = $_SESSION["studentid"];
echo "\$studentid= $studentid<br>";
}


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