dOPC Client Toolkit Help file
TdOPCServer.QueryAvailableProperties Method
public: __fastcall boolean QueryAvailableProperties(
    AnsiString ItemId, 
    TStrings Props
public boolean QueryAvailableProperties(
    String ItemId, 
    TStrings Props
Visual Basic
Public Function QueryAvailableProperties(
    ItemId As String, 
    Props As TStrings
) As boolean

QueryAvailableProperties returns True if the Props parameter, representing a list of available properties on the server, could be filled for the passed ItemId, otherwise False.

The properties list is usually consistent for a particular ItemID. Changes in the underlying system's configuration might however affect the list.

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