How do I tell if a class is WSS or MOSS specific?

How do I tell if a SharePoint class is specific to WSS or MOSS?

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For example, can I use the SPAudit class in MOSS only?

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I do it by looking at which DLL contains the class.

For example most SharePoint API functionality is located in the Microsoft.SharePoint.dll (which is WSS). Another example is the Microsoft.SharePoint.Publishing.dll which is MOSS only.

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The SPAudit class works for WSS as well as MOSS, even though the user interface is available in MOSS only.

Like JD Said, have a look at the DLL. If your API requires Microsoft.Office.* then it is MOSS only.

Have a look here for detecting MOSS using code.