Just a front end
Its just a front end for the Screen Sharing app already installed (though fairly hidden) on your Mac. I like the built-in Screen Sharing app, but it has limitations, such at not being able to connect to a local VNC server. In my case, Im not connecting to a truly local vnc server, but one thats been ssh tunneled to localhost. Because this piece of software is just a front end for the software I already have, its unable to make that connection.
cadeon924 about
Remote Desktop - VNC