Executes additional initialization produres.
virtual int InternalOpen() = 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 initialization procedures.
If the derived class does not need any extra initialization then the method must return wclCommon::WCL_E_SUCCESS result code.
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