Why use or integrate receiving a silent post into Dynamic Forms and Dynamic Registration? Simple! You can take advantage of all of the features including the ability to submit form data, ability to register a user within DNN, ability to utilize all form completion events within the modules etc... So you could technically use PHP/Joomla/Flash or Action SCript, or maybe another DNN Site that might be sending an HTTP Form Post to your module and you can then utilize all of the features of Dynamic Forms and Dynamic Registration as if the user went to the site and typed in all of those fields directly.