Disk Operating System

This operating system was the first, that was installed on personal computers widely, Bill Gates (Microsoft Corporation) firstly developed PC-Dos for IMB, then he got its rights for its new version MS-Dos. DOS was a non-graphical interface not friendly like Windows operating systems, and basically work on commands, now a days Windows operating system still support DOS interface for special tasks, and it provide the DOS non-graphical interface.

Find MAC address of LAN computer

Get MAC Addres of a compute on LAN
Goto start and Run
type Cmd
and at Dos prompt type
Ping xxx.xxx.xxx.xxx (Ip address of the computer you want to get its MAC address)
when you get the reply
type arp -a
It will show you MAC address under the physical address

Delete Temporary Files

Goto Run
Type  %temp%
Press Ctrl + A (To select all files)
then press delete or
Hold down the Shift key + Del to delete all files directly without send them to recycle bin

System Properties (Enable, Disable)

If you want to disable or unable System Properties option. Go to start and type Regedit and press enter. Go to the following registry key. Hkey_Current_User \ Software \ Microsoft \ Windows \ Currentversion \ Policies \ Explorer Modify/ then create dword data type Reg_Dword and name it (nopropertiesmycomputer)
(0 is use to show the properties / 1 is use to hide the system properties) save settings exit from registry and restart your computer.

ROM

ROM stands for Read Only Memory. ROM is a permanent memory even when you shutdown the computer, the configuration in ROM will remain in memory, the primary purpose of ROM is to tell the computer whenever it starts that how you run the operating system in RAM, it tells the computer about boot sequence, at start up, it checks the hardware, this is a permanent memory in computer, but you can upgrade it by changing the chip physically, but you can also upgrade firmware through software.