Microsoft launch they Windows operating system in 1985. For the first time Windows has provided three different menus of commands and mouse supported Windows operating system and is connected between the computer and the user interface.

The pointing device such as a mouse, graphic tablets and light pens etc. Easy right to use and provides full environment to operate a computer entertainment hy.aym MS DOS operating system command interface. Windows is a (Graphical User Interface) GUI operating system.

This means that the user select command in the Windows Graphics (images). And in this we can perform various functions. For example, to enter data, video drive, this program thigh, to change the writing style, to put numbers on the lines and check spelling. That's why Windows has made it extremely easy for users to operate.

The windows is called for. That we run multiple programs open in a separate window above it in every command of the program. For example, we have a letter in MS Word or DOS application etc. that are standing on. When you hear a song in his Urdu work or on the other hand, we can change just one thing.

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Various versions of Microsoft Windows since 1990 have carried F. The Windows 3, Windows 95, Windows 98, Windows NT (NT), Windows ME (ME), Windows 2000 and Window s XP (XP) are hyn.unduz is the most important Windows NT in all versions. The DOS (DOS) and Unix (UNIX). This also facilitates the use of it to be used for most computer networks across (Client / Server) operating system is called.

What is DOS (DOS)? Internal and external DOS commands.

The single-user computers use Microsoft operating system called DOS disk operating system that mhff. Dos controls the input and output modes. And enables the user to program the load and driving could DOS Computer highly successful operating system in history.

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The New Improved (Improved) micro-processor has been developed so that the operating system updates are made -and ten different versions of DOS. For example, MS-DOS 3.0, MS-DOS 3.1, MS-DOS 4.0, PC-DOS 5.0, DOS 7.0 and DOS 8.0 and the new version.

There are two types of commands.

The old version of MS-DOS and PC-DOS.

• Internal commands .
• External commands.

Internal Commands.

One are stored in internal or internal commands (Internal Commands) When we run PC DOS internal commands in the directory settings file that may never see .The memory that is loaded automatically during Bouvet-up process. These commands are always in RAM. Internal DOS commands are listed below.

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CLS, DIR, DIR Switches, DATE, TIME, COPY CON, TYPE, REN, DEL / ERASE, MD / MKDIR, CD / CHDIR, RD / RMDIR, COPY, VER, VOL, REM, PROMPT, PATH

External commands.

Two are external or external commands (External Commands) Most DOS commands that usually are called external commands These commands are not used except for special factors DOS user access to file and memory management facilities.

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Some external DOS commands are the following: CHKDSK, COMP, DISKCOPY, DELTREE, EDIT, FORMAT, PRINT, SORT, LABEL, XCOPY.

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