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1. C H A P T E R 2
C L I E N T / S E R V E R C O M P U T I N G
Client/Server Components

2. Operating System
 Is an important program that runs on every computer.
 Acts as an intermediary and allows communication
between hardware and software.
 Is a system software comprising fundamental files needed
to boot up and function ones computer.
 Performs basic task such as recognizing input from the
keyboard, sending output to the display screen, keeping
track of files and directories, controlling peripheral devices
etc.

3. Operating System
 Makes sure that different program and users running at the
same time do not interfere with each other.
 Is also responsible for security, ensuring that unauthorized
users do not get access to the system.

4. Services of OS
 Following are the main services of OS
 Carrying out commands of user and the application programs
 Supervising installation and running of other programs and
hardware
 Controlling the input output functions
 Allocating system resources such as memory, processor time,
disk space and peripheral devices to regulate the flow of work
within the computer

5. Services of OS
o Handling file and directory management
o Providing file sharing and networking functions

6. Classification of OS
 Multi-user
 allows two or more users to run the programs at the same time.
 E.g. a Unix server where multiple remote users have access to the Unix
shell prompt
 Multiprocessing
 Supports running a program on more than one CPU
 Multitasking
 Allows more than one program to run concurrently
 Real Time
 Responds to input instantly.
 A common example of RTOS is and HDTV receiver and display as it
needs to read a digital signal, decode it and display it as the data
comes in.

7. Network Operating System
 Is a computer operating system that are designed primarily
to support workstation, personal computer and in some
instances older terminal connected through LANs.
 Is a software that allows multiple computers to
communicate, share files and hardware devices with one
another.
 Provides services to clients over network
 E.g. Novell NetWare, Microsoft Windows NT, Sun Solaris,
Linux etc

8. Services of NOS
 Both the client/server and peer to peer networking models
uses network operating system and such a system must be
able to perform following duties.
 Providing access to remote devices, managing which users are
using which device and when
 Enabling and managing access to files on remote system and
determining who can access what and who can’t
 Granting access to remote applications and resources such as
internet and making those resources seem like local resources
to the user

9. Services of NOS
 Providing routing services so that the operating system
knows what data to send where
 Monitoring the system and security so as to provide
proper security against viruses, hackers and data
corruption
 providing basic administrator utilities, enabling an
administrator to perform task involving managing
network resources and users.