Page 62 - DCAP104_EXPOSURE_TO_COMPUTER_DISCPLINES

Unit 3: Using Operating System

• Operating system is an interface between your computer and the outside world. Notes
• Multiuser is a term that defines an operating system or applications Software that allows
concurrent access by multiple users of a computer.
• Utilities are often rather technical and targeted at people with an advanced level of computer
knowledge.

1. Configuring your Host Operating System’s SNMP.

2. How we manage hardware in Operating Systems?

3.9 Keywords

Directory Access Permissions: A directory’s access permissions help to control access to the files
in it. These affect the overall ability to use files and subdirectories in the directory.
Driver: A driver is a specially written program which understands the operation of the device it
interfaces to, such as a printer, video card, sound card or CD ROM drive.

File Access Permissions: The access permissions on a file control what can be done to the file’s
contents.

Graphical User Interfaces: Most of the modern computer systems support graphical user interfaces
(GUI), and often include them. In some computer systems, such as the original implementation
of Mac OS, the GUI is integrated into the kernel.
Multi-User: Is a term that defines an operating system or application software that allows
concurrent access by multiple users of a computer.
Process Communication: Mutual exclusion of operations on shared variables makes it possible
to make meaningful statements about the effect of concurrent computations.
Real-Time Operating System (RTOS): Real-time operating systems are used to control machinery,
scientific instruments and industrial systems.

Single-User, Multitasking: This is the type of operating system most people use on their desktop
and laptop computers today.

Single-User, Single Task: As the name implies, this operating system is designed to manage the
computer so that one user can effectively do one thing at a time.

Supervisor and User Mode: In computer terms, supervisor mode is a hardware-mediated flag
which can be changed by code running in system-level software.

System Calls: In computing, a system call is the mechanism used by an application program to
request service from the operating system based on the monolithic kernel or to system servers
on operating systems based on the microkernel-structure.
The Root Menu: If you move the pointer onto the root window (the “desktop” behind the windows)
and press the correct mouse button (usually the first or third button, depending on your setup),
you should see the root menu .

The xterm Window: One of the most important windows is an xterm window. xterm makes a
terminal emulator window with a UNIX login session inside, just like a miniature terminal.

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