This document discusses different types of operating systems including single-user and multi-user systems. It defines operating systems as the most important software that provides a platform for applications to run. Operating systems are classified into categories like multi-user, multi-processor, multitasking, and multi-threading, which allow for multiple users, CPUs, programs, and parts of a program to run simultaneously.

1. SYSTEM OPERATING
The most important software or a
computer program.
More systems are used in PC Dos,
Os / 2 and Windows.
MILTIUSUARIO
Allows two or more users to use
the same time.
MULTI PROCESSOR
Supports open the program in a
CPU.
MULTITASKING
Allows multiple programs to run
simultaneously.
MULTI-LEG
Allows different parts of a single
program running at the same time.
Provide a software platform upon
which other programs, called
applications can operate.
They are classified into:
Comprising: