Also so gehts schonmal nicht:
index.php
<?php
session_start();
$vari1 = 'text1';
print "vari1: $vari1";
print "<br><a href="next.php">Weiter</a>";
?>
next.php
<?php
session_start();
$vari1 = $_SESSION["vari1"];
print "vari1: $vari1";
print "<br><a href="index.php">Zurück</a>";
?>
hmmhmhmm