The components are designed to manage Windows 9X, Windows NT, Windows 2000, Windows XP operating systems. The components are "network enabled": you may use them to configure a local computer, or a network host. All the components are employing WMI technology from Microsoft *.

This technology is relatively new. It first appeared in late service packs for Windows NT. To understand why this technology came to existence, one must spend a great deal of time programming Windows API. After a while you start realizing that one and the same task must be performed in many different ways, depending on which area of API you are using.

For example, you will have to remember which method to use to release memory in each particular case: LsaFreeMemory , FreeContextBuffer , WTSFreeMemory , NetApiBufferFree or something else? WMI offers a unified approach. It does not matter what you need to manage, user accounts or hardware settings.

You will need to know one and the same set of COM interfaces. This way WMI brings an end, and a relief from API problems. However, it comes at a price. As with any generic approach, it may be not easy to resolve a concrete task. Now you are responsible for dealing with HRESULT. You will have to interrogate WMI core to learn what properties and methods a particular object has. You may have to write up to a page of code to prepare method parameters, call the method and retrieve the results.

You need to learn one more language: WQL.


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