Operating System

1. Functions

1.1. Adm. of the processor

1.2. Input/output management

1.3. Application execution

2. Classification

2.1. Multi-user: Allows two or more users to run programs at the same time.

2.2. Multiprocessing: Supports running a program on more than one CPU.

2.3. Multitasking: Allows more than one program run concurrently.

2.4. Multithreading: Allows different parts of a single program to run concurrently.

2.5. Real time: Responds to input instatly. General-purpose operatin systems, such as DOS and UNIX, are real-time.

3. Types

3.1. DOS

3.2. Windows

3.3. Linux

3.4. Mac Os