Peeking into IDispatch

I'm somewhat new to OLE Automation and am having a difficult time finding concise and relatively complete documentation on working with the standard COM interface IDispatch.

There is the method IDispatch::GetIDsOfNames to get the DISPID of a known method.  But what if I don't know the names?  How can the names of the available methods be retrieved?
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raybAsked:
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galkinCommented:
GetIDsOfNames is passed array of names and allocated aray for IDs. You must implement this method to fill in IDs array. Information about properties and methods names and IDs is stored in type library so DispGetIDsOfNames standard wrapper function should be used
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