file index.html:

<form action="demo.php"  enctype="multipart/form-data" method="post">
<input type="file" name="file" />
<input name="UPLOAD_IDENTIFIER" value="18" type="hidden">
<input type="submit" />
</form>

file demo.php:
<?php

 $file_name=$_FILES["file"]["tmp_name"];
 echo "$file_name ok";
?>

file info.php:
<?php
$data=uploadprogress_get_info("18");

echo "<pre>";
echo var_dump($data);
echo "</pre>";
?>