The Data Interchange Format (DIF) is a standardized file format used to transfer computer files such as spreadsheets or databases between different programs and systems.
Open architecture is a type of computer architecture whose details are made fully public, allowing other manufacturers to create compatible hardware and software. The architecture of the original IBM PC is an example of open architecture.
A PC-compatible computer is capable of running software that is intended for the IBM PC. Virtually all microcomputers currently available, including some made by Apple Computer, are PC-compatible.
A proprietary operating system is specifically designed to run on only one type of computer, limiting the ability of software applications to run on other systems and also constraining the market for any application software exclusive to that OS.
