Probiert es selber aus: http://www.gate-2-world.com/index.php
Hier noch der Quellcode zu "index.php":
<html>
<head>
<meta http-equiv="Content-Language" content="de-ch">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Test</title>
</head>
<body>
<p>Test-Formular</p>
<br><br>
<? echo"$Button1"; ?>
<br><br>
<? include('kontaktform.php'); ?>
</body>
</html>
Hier noch der Quellcode zu "kontaktform.php":
<FORM action="index.php" method=post>
<input type="text" name="T1" size="20"><input type="submit" value="Abschicken" name="Button1"></p>
</form>