Whenever I hear online, I alsways think it is on the internet. I had an html User docuemtnation that displayed when the user selected Help from the menu. If that is what you meant by online, then so was mine.
Now for the server I also had a simple GUI with a button on it, but I also had a Help menu for the another html document. However, if your server is just start it up, and that's it and that is in your readme.txt, then I don't see the need for another "User Documentation" for your server. Just how to stop it.
Mark