My old iPad one still works fine but has been seperceded by my iPad 3. I have a mac mini desktop computer that I love. Due to its small size, I can easily take the mac mini with me on vacation trips---but would hate to worry with that seventeen inch outboard monitor. I am therefore wondering if I can use my iPad 1 as the only monitor for my mac mini? I use the word "only" because I know I can use one as an extension screen. My question is---is there an app which allows me to boot up to the iPad as the system screen?