Programable Clipboard stuffer

Pay attention here guys... This may sound complicated, but what I want is pretty straight forward -- although I don't know how to get to this point. I am looking for an INSTALLABLE program written for windows (compatible with vista and win7). I fill out web forms all day long, and looking for a program that will take information from a file or files and replace it into the clipboard buffer and then paste it in the current field. The way I see this is a configuration utility to assign "tag" names, and a file name that will hold the "tag" data. ideally there would be 7 to 10 different tags, but ultimately it would be nice if you could add as many as you wanted. once configured, the program should operate as follows. You browse web, and your filling out a form. For example, let's say we are filling out a survey questionaire, and the fields are subject, comments, name, username, password, birthday. For whatever reason, we are filling out this information with random information in various text files. One for each field name (previously defined in the tag configuration. When I get to the comments field I right click, and select the option for TAG: Comments, and it pastes a random line from the "comments" file listed in the configuration. The same for name. Right click and select the option for TAG: Name. When it comes to usernames and passwords, I'd like a shared file in the format username,password. Right clicking on the username field and selecting the TAG: username will paste the username in. The username TAG is then greyed out and not available to be pasted again until the password that matches that username is pasted in the next password field. Is this something that can be accomplished fairly easily? Let's discuss. Prefer being done in c# if possible. Source code required at end of job.