You all might have used CTime or CTimeSpan to manipulate the system timer. Here is an article to show you how your system timer works. I will give you an idea of port communications behind the system clock manipulations. Those who are a little biased on hardware and software interfacing practices would find this article of great help.

Packet : 89346512basictime.zip filelist
BasicTime/
BasicTime/BaseTime.cpp
BasicTime/BaseTime.h
BasicTime/BasicTime.aps
BasicTime/BasicTime.clw
BasicTime/BasicTime.cpp
BasicTime/BasicTime.dsp
BasicTime/BasicTime.dsw
BasicTime/BasicTime.h
BasicTime/BasicTime.ncb
BasicTime/BasicTime.opt
BasicTime/BasicTime.plg
BasicTime/BasicTime.rc
BasicTime/BasicTimeDlg.cpp
BasicTime/BasicTimeDlg.h
BasicTime/Debug/
BasicTime/ReadMe.txt
BasicTime/res/
BasicTime/resource.h
BasicTime/res/BasicTime.ico
BasicTime/res/BasicTime.rc2
BasicTime/StdAfx.cpp
BasicTime/StdAfx.h

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