press start button and press run or press win key+r
and then one of these command for follewing purpose
Calc-----------–Calculator
Cfgwiz32-------–ISDN Configuration Wizard
Charmap---------character Map
Chkdisk--------–Repair damaged files
Cleanmgr-------–Cleans up hard drives
Clipbrd---------Windows Clipboard viewer
Control---------Displays Control Panel
Cmd------------–Opens a new Command Window
Control mouse--–Used to control mouse properties
Dcomcnfg-------–DCOM user security
Debug----------–Assembly language programming tool
Defrag---------–Defragmentation tool
Drwatson-------–Records programs crash & snapshots
Dxdiag---------–DirectX Diagnostic Utility
Explorer-------–Windows Explorer