The Mac has no central equivalent of the System window on a Windows PC. But its functions have analogs here:
General tab . To find out your Mac OS X version number and the amount of memory on your Mac, choose About This Mac.
Computer Name tab . Open System Preferences, click Sharing, and edit your computer's network names here.
Hardware tab . The closest thing the Mac has to the Device Manager is System Profiler (in your Applications Utilities folder). See Section 14.24.21.
Advanced tab . In Mac OS X, you can't easily adjust your virtual memory, processor scheduling, or user profile information.
System Restore tab . This feature isn't available in Mac OS X.
Automatic Updates tab . Open System Preferences and click Software Updates.
Remote tab . These features are unavailable in Mac OS X.