A form processing script resides on your server and takes information submitted to it from your form, processes it. They can do all kinds of things, from sending emails, to uploading images, to spitting out search results. They can also do absolutely nothing, if installed on a server that's not set up for them. Dreamweaver can't create a form processing script for you, that you'll need either a fairly experienced programmer, a 3rd party script, or a third party app (like Google) that moves all the heavy lifting off your server.
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