A general purpose package (GPP) is a computer program that allows users to enter and manipulate information. Examples of GPPs include word processing, spreadsheet, database, and presentation software. When purchasing a GPP, users receive a CD containing the program, manual, tutorials, and installation files. The human-computer interface (HCI) allows users to interact with GPPs through graphical user interfaces, icons, menus, and pointers. Users can customize aspects of the HCI like colors and toolbars. Integrated packages combine multiple GPPs into a single program but may have reduced features or memory usage compared to individual programs. Data linkage between files in a package can be static, where changes in one file do not