1.The key difference between general-computing operating systems and real-time operating systems is the need for "deterministic" timing in the real-time operating systems.
2. The part of the operating system that resides in main memory (internal instructions) is most important; without these instructions, the computer cannot .
3. Almost all computers, including handheld computers, desktop computers, supercomputers, and even video game consoles, use an system of some type.
4. The Program manager is called Windows Explorer, Buttons and scroll-bars an attractive, three dimensional look.
5. Linux is used as a highly value, fully-functional UNIX – workstation for applications from Internet servers to reliable work group computing.
6. A system profiler provide detailed information about the software installed and hardware attached to the computer.
7. Macintosh computers- with a user interface based on graphics and intuitive tools-were designed with a single clear aim: to interaction with the computer.
8. The processing of hardware interrupts is a task that is usually delegated software called device drivers, which may be either part of the operating system's kernel, part of another program, or both.
9. Typical applications : industrial automation, business software, educational software, medical software, databases, and computer games.
10. Programming languages have evolved over time from sequences of ones and zeros directly interpretable by a computer, through symbolic machine code, assembly languages, and finally to higher-level languages that are understandable to humans.