it is not visible, you can not input anything
this field is to send along some variable
that will show the processing script some useful data
<form>
<input type="hidden" name="action" value="delete_file">
Filename: <input type="text" name="filename">
<input type="submit" value="Submit">
</form>
<?php
if ( $_POST['action'] == 'delete_file' ){
// delete $_POST['filename'];
}
