Multiplatform simple web browser (using qt library) & file downloader

A Multiplatform (using Qt library) Program (Windows, Mac, Linux), that is a kind of webrowser using WebKit, which load only one website (no back,next button visible, user cannot navigate to another web address). Right menu should be locked (user wont see right click menu when tires to click). When there is a internet connection problem, browser will show a custom 404 local page, with button "Retry" (Refresh). Software will register custom protocol handler for link "mylink://". When logged to specyfied website, cookies should not expire in this browser. Software will manage downloads when clicked to mylink:// - it will check if file is already downloaded. And if yes, then it will execute it. If not exist on the disk, it will download it and ask to launch. All downloads should be save in application data folder. In Windows browser should not require Admin permission to do this. When downloading, a progress should be visible with percentage and simple gif annimation (like [login to view URL]) - but 16px x 16px max size. User can download only one file at same time. Software should inform that currenlty another file is being downloadin and ask to cancel downloadin last file and start downloading new one? (Yes, No). Qt projet source code should be included.