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PHP SCRIPT:----

<FORM METHOD="POST">
  Type in password &nbsp&nbsp&nbsp <input type="password" name="zpass" size="6" />
  &nbsp&nbsp&nbsp<input type="submit" value="Submit" />
</FORM>
<?php
print("zpass=$HTTP_POST_VARS[zpass]");
   ECHO "<BR><BR><BR>";
      ECHO "<BR><BR><BR>";
echo $GLOBALS["zpass"];
   ECHO "<BR><BR><BR>";
foreach ($HTTP_POST_VARS as $Key=>$Value)
{
  echo "<LI>\$GLOBALS[\"$Key\"]=$Value\n";
}
echo "<br>";

?>

PHP SCRIPT:----

<FORM METHOD="POST">
  Type in password &nbsp&nbsp&nbsp <input type="password" name="zpass"
size="6" />
  &nbsp&nbsp&nbsp<input type="submit" value="Submit" />
</FORM>
<?php
print("zpass=$HTTP_POST_VARS[zpass]");
   ECHO "<BR><BR><BR>";
      ECHO "<BR><BR><BR>";
echo $GLOBALS["zpass"];
   ECHO "<BR><BR><BR>";
foreach ($HTTP_POST_VARS as $Key=>$Value)
{
  echo "<LI>\$GLOBALS[\"$Key\"]=$Value\n";
}
echo "<br>";

?>

Cannot reproduce the problem neither on Windows 2000 or Linux. It most probably a problem with your installation.