Executes additional finalization produres.
virtual int InternalClose() = 0;
If the function succeed the return value is wclCommon::WCL_E_SUCCESS. Otherwise the method returns one of the WCL error codes.
The derived class must override this method to execute extra finalization procedures.
If the derived class does not need any extra finalization then the method must return wclCommon::WCL_E_SUCCESS result code.
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