I would like my C++ command-based program to paste programmed characters into a form anywhere on my computer. Is there a way to write it to the form's address? Once the characters are in any necessary form(s), I would have the program activate the submit button on the forms page. How would I go about implementing this?
I'm going to assume you are using windows... So you might want to take a look at the WinAPI/MFC, I know there are ways to do this, most likely something involving the Windows Message system. You may want to take a look at some tutorials on the WinAPI and read through the msdn website.
If you are only trying to do this in say, firefox though. Just take a look at creating Firefox/Grease Monkey addons. That would be much easier and won't require a week or two of learning the WinAPI.