It is not a "Home file," it is the Home folder (or directory). Each account on the computer has its own Home folder. It is created when the account is established on the machine. Each Home folder has subfolders for Applications, Desktop, Documents, Library, Movies, Music, Pictures, Public, and Sites. At the root level of your hard drive are folders for Applications, Applications (Mac OS 9) [on PPC computers with Classic installed], Developer [if the Development Tools are installed], Documents, Library, System, System Folder [on PPC computers with Classic installed], and Users. The root level folders provide resourses for all users, but can only be changed by a user with administrative or higher privileges. The resources in your Home folder can only be changed by you. If you have an application in your Home folder's Applications's subfolder, then you installed it. If the application also resides in your global Applications folder, then you installed it in your Home folder unnecessarily.