The title says it almost all. There are tools like AutoHotKey and AutoIt that allow one to send text to fill up on-line web forms and process the the POST answer.
I know that Rebol can do the latter. But what about the former?
There's a script I wrote which was to look at web forms, extract the various variables, and allow you to POST the form, and then capture the output. This was just a test prior to figuring out how to automate the login to Stackoverflow which has since been done.