Sending more information after purchase

I have a question that I would think would be typical, but I can't seem to find it on the forums.

I would like to have a special e-mail sent to people who purchase a specific product.

-This could be used in concert or other ticket venues to send a printable ticket or specific details for the event
-This could be used to send directions or installation instructions to someone who purchases an ebook or software product
-This could be used to send an unlock code for shareware
-This could be used to send form to gather information for a custom product

This would be separate from the confirmation e-mail, since that may or may not have this product on it. Any help is appreciated.

mC