About the blog

Basically I am an IT professional .This is specially for my friends in " DISHA ORPHAN SCHOOLS" . Please post questions here instead of sending the mail to me for avoiding repetative questions .I am very curious on guide people like you with my little knowledge . Please put your question here . I will answer your questions for sure .
I AM DEDICATING THIS BLOG TO ONE MY BEST FRIEND ON HER BIRTHDAY. PLEASE WISH LOTS OF HAPPINESS FOR HER.
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ALSO LET ME KNOW THE TOPICS YOU WANT ME TO COVER HERE . I HAVE JUST PUT OPERATING SYSTEM AS AN EXAMPLE. REQUEST YOU TO USE THIS BLOG AS A HELPFUL MATERIAL.

Your friend
Abhijit Naik

Operating system

The most important program that runs on a computer. Every general-purpose computer must have an operating system to run other programs. Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. For large systems, the operating system has even greater responsibilities and powers. It is like a traffic cop -- it makes sure that different programs and users running at the same time do not interfere with each other.

Operating systems can be classified as follows:

multi-user : Allows two or more users to run programs at the same time.
multiprocessing : Supports running a program on more than one CPU.
multitasking : Allows more than one program to run concurrently.
multithreading : Allows different parts of a single program to run concurrently.
real time: Responds to input instantly. General-purpose operating systems, such as DOS and UNIX, are not real-time.