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&gt;&gt;Are they based on the same function, what is their relation ??<br />
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They're based on the same functionality/technology and read the data from the HKEY_PERFORMANCE_DATA key in the registry.<br />
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&gt;&gt;And, what should I use to make a performance monitoring tool ??<br />
<br />
That depends - if you are already using WMI or VB, I'd go that way, but from e.g. C++, WMI interfaces are more than cumbersome to handle.
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>>Are they based on the same function, what is their relation ??

They're based on the same functionality/technology and read the data from the HKEY_PERFORMANCE_DATA key in the registry.

>>And, what should I use to make a performance monitoring tool ??

That depends - if you are already using WMI or VB, I'd go that way, but from e.g. C++, WMI interfaces are more than cumbersome to handle.

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Thanks for your answer.<br />
And which of the two requires less system resources (or, is there no difference sindse they are based on the same registry-key )?? 
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Thanks for your answer.
And which of the two requires less system resources (or, is there no difference sindse they are based on the same registry-key )??

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I wonder what the differences are between the Performance Data Helper ( <a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/perfmon/base/performance_data_helper.asp" rel="ugc nofollow">http://msdn.microsoft.com/library/default.asp?url=/library/en-us/perfmon/base/performance_data_helper.asp</a>&nbsp;) and the WMI Performance Counter Classes ( <a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/performance_counter_classes.asp" rel="ugc">http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/performance_counter_classes.asp</a>). Are they based on the same function, what is their relation ??<br />
And, what should I use to make a performance monitoring tool ??<br />
<br />
Thanks in advance, any idea/contribution is very appreciated 
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I wonder what the differences are between the Performance Data Helper ( http://msdn.microsoft.com/library/default.asp?url=/library/en-us/perfmon/base/performance_data_helper.asp ) and the WMI Performance Counter Classes ( http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/performance_counter_classes.asp). Are they based on the same function, what is their relation ??
And, what should I use to make a performance monitoring tool ??

Thanks in advance, any idea/contribution is very appreciated 

Performance : Difference between PDH and WMI Performance Counters

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