Windows Operating Systems have many handy utilities to manage and control the PC, most of these are accessible through control panel, but you can also access all these utilities through windows command prompt. Here is the list of command:
Add Hardware Wizard : hdwwiz.cpl
Add/Remove Programs : appwiz.cpl
Administrative Tools : control admintools
Bluetooth Transfer Wizard : fsquirt
Calculator : calc
Certificate Manager : certmgr.msc
Character Map : charmap
Check Disk Utility : chkdsk
Clipboard Viewer : clipbrd
Command Prompt : cmd
Component Services : dcomcnfg
Computer Management : compmgmt.msc
Control Panel : control
Date and Time Properties : timedate.cpl
DDE Shares : ddeshare
Device Manager : devmgmt.msc
Direct X Troubleshooter : dxdiag
Disk Cleanup Utility : cleanmgr
Disk Defragment : dfrg.msc
Disk Management : diskmgmt.msc
Disk Partition Manager : diskpart
Display Properties : control desktop
Display Properties : desk.cpl
Dr. Watson System Troubleshooting Utility : drwtsn32
Driver Verifier Utility : verifier
Event Viewer : eventvwr.msc
Files and Settings Transfer Tool : migwiz
File Signature Verification Tool : sigverif
Findfast : findfast.cpl
Firefox : firefox
Folders Properties : control folders
Fonts : control fonts
Fonts Folder : fonts
Free Cell Card Game : freecell
Game Controllers : joy.cpl
Group Policy Editor (for xp professional) : gpedit.msc
Hearts Card Game : mshearts
Help and Support : helpctr
HyperTerminal : hypertrm
Iexpress Wizard : iexpress
Indexing Service : ciadv.msc
Internet Connection Wizard : icwconn1
Internet Explorer : iexplore
Internet Properties : inetcpl.cpl
Keyboard Properties : control keyboard
Local Security Settings : secpol.msc
Local Users and Groups : lusrmgr.msc
Logs You Out Of Windows : logoff
Malicious Software Removal Tool : mrt
Microsoft Chat : winchat
Microsoft Movie Maker : moviemk
Microsoft Paint : mspaint
Microsoft Syncronization Tool : mobsync
Minesweeper Game : winmine
Mouse Properties : control mouse
Mouse Properties : main.cpl
Netmeeting : conf
Network Connections : control netconnections
Network Connections : ncpa.cpl
Network Setup Wizard : netsetup.cpl
Notepad : notepad
Object Packager : packager
ODBC Data Source Administrator : odbccp32.cpl
On Screen Keyboard : osk
Outlook Express : msimn
Paint : pbrush
Password Properties : password.cpl
Performance Monitor : perfmon.msc
Performance Monitor : perfmon
Phone and Modem Options : telephon.cpl
Phone Dialer : dialer
Pinball Game : pinball
Power Configuration : powercfg.cpl
Printers and Faxes : control printers
Printers Folder : printers
Regional Settings : intl.cpl
Registry Editor : regedit
Registry Editor : regedit32
Remote Access Phonebook : rasphone
Remote Desktop : mstsc
Removable Storage : ntmsmgr.msc
Removable Storage Operator Requests : ntmsoprq.msc
Resultant Set of Policy (for xp professional) : rsop.msc
Scanners and Cameras : sticpl.cpl
Scheduled Tasks : control schedtasks
Security Center : wscui.cpl
Services : services.msc
Shared Folders : fsmgmt.msc
Shuts Down Windows : shutdown
Sounds and Audio : mmsys.cpl
Spider Solitare Card Game : spider
SQL Client Configuration : cliconfg
System Configuration Editor : sysedit
System Configuration Utility : msconfig
System Information : msinfo32
System Properties : sysdm.cpl
Task Manager : taskmgr
TCP Tester : tcptest
Telnet Client : telnet
User Account Management : nusrmgr.cpl
Utility Manager : utilman
Windows Address Book : wab
Windows Address Book Import Utility : wabmig
Windows Explorer : explorer
Please note that some of the commands may not work on a specific OS.