I would like to capture key presses from my users. How do I do this for alphabetic and how do I do it for the backspace or the delete key?

Why do you want to do this? You would essentially be creating a keylogger.

Are you doing this because you are looking for a specific key press?

Just the delete key and the backspace key. I was having trouble and I thought that was the best way to fix it but I found another fix so it is no longer important.