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1. An aplications software package does not communicate directly with the hardware, whereas an operating system is a set of programs that lies between applications software and the computer hardware.

2. The supervisor program is the most important operating system program because it controls the entire operating system and loads into memory other operating system programs from disk storage only as needed.

3. A resident program is the program most of which remains in memory, whereas a non-resident program is the program which is loaded into memory.

4. An operating system has three main functions: (1) manage the computer's resources, such as the central processing unit, memory, disk drives, and printers, (2) establish a user interface, and (3) execute and provide services for applications software.

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