Public Class UnknownClass
...
...
Public Property UnknownProperty as...
get
...
set
...
end property

Public Sub UnknownSub()
...
end sub

End Class

Dim myDerivedclass as new UnknownClass
myDerivedclass.UnknownProperty = ....
myDerivedclass.UnknownSub()

typedef struct tagVARIANT VARIANT;

typedef struct tagVARIANT VARIANTARG;

struct tagVARIANT {
    union {
        struct __tagVARIANT {
            VARTYPE vt;
            WORD wReserved1;
            WORD wReserved2;
            WORD wReserved3;
            union {
                LONGLONG llVal;
                LONG lVal;
                BYTE bVal;
                SHORT iVal;
                FLOAT fltVal;
                OUBLE dblVal;
                VARIANT_BOOL boolVal;
                _VARIANT_BOOL bool;
                SCODE scode;
                CY cyVal;
                ATE date;
                BSTR bstrVal;
                IUnknown *punkVal;
                IDispatch *pdispVal;
                SAFEARRAY *parray;
                BYTE *pbVal;
                SHORT *piVal;
                LONG *plVal;
                LONGLONG *pllVal;
                FLOAT *pfltVal;
                OUBLE *pdblVal;
                VARIANT_BOOL *pboolVal;
                _VARIANT_BOOL *pbool;
                SCODE *pscode;
                CY *pcyVal;
                ATE *pdate;
                BSTR *pbstrVal;
                IUnknown **ppunkVal;
                IDispatch **ppdispVal;
                SAFEARRAY **pparray;
                VARIANT *pvarVal;
                PVOID byref;
                CHAR cVal;
                USHORT uiVal;
                ULONG ulVal;
                ULONGLONG ullVal;
                INT intVal;
                UINT uintVal;
                ECIMAL *pdecVal;
                CHAR *pcVal;
                USHORT *puiVal;
                ULONG *pulVal;
                ULONGLONG *pullVal;
                INT *pintVal;
                UINT *puintVal;
                struct __tagBRECORD {
                    PVOID pvRecord;
                    IRecordInfo *pRecInfo;
                } __VARIANT_NAME_4;
                }    __VARIANT_NAME_3;

            }    __VARIANT_NAME_2;

        ECIMAL decVal;

        }    __VARIANT_NAME_1;

struct tagVARIANT {
    union {
       struct __tagVARIANT {
          VARTYPE vt;
          WORD wReserved1;
          WORD wReserved2;
          WORD wReserved3;
   union {
      LONGLONG                llval;             // VT_I8.
      LONG                    lVal;              // VT_I4.
      BYTE                    bVal;              // VT_UI1.
      SHORT                   iVal;              // VT_I2.
      FLOAT                   fltVal;            // VT_R4.
      OUBLE                  dblVal;            // VT_R8.
      VARIANT_BOOL            boolVal;           // VT_BOOL.
      _VARIANT_BOOL           bool;
      SCODE                   scode;             // VT_ERROR.
      CY                      cyVal;             // VT_CY.
      ATE                    date;              // VT_DATE.
      BSTR                    bstrVal;           // VT_BSTR.
      IUnknown                * punkVal;         // VT_UNKNOWN.
      IDispatch               * pdispVal;        // VT_DISPATCH.
      SAFEARRAY               * parray;          // VT_ARRAY|*.
      BYTE                    * pbVal;           // VT_BYREF|VT_UI1.
      SHORT                   * piVal;           // VT_BYREF|VT_I2.
      LONG                    * plVal;           // VT_BYREF|VT_I4.
      LONGLONG                * pllVal;          // VT_BYREF|VT_I8.
      FLOAT                   * pfltVal;         // VT_BYREF|VT_R4.
      OUBLE                  * pdblVal;         // VT_BYREF|VT_R8.
      VARIANT_BOOL            * pboolVal;        // VT_BYREF|VT_BOOL.
      _VARIANT_BOOL           * pbool;
      SCODE                   * pscode;          // VT_BYREF|VT_ERROR.
      CY                      * pcyVal;          // VT_BYREF|VT_CY.
      ATE                    * pdate;           // VT_BYREF|VT_DATE.
      BSTR                    * pbstrVal;        // VT_BYREF|VT_BSTR.
      IUnknown                ** ppunkVal;       // VT_BYREF|VT_UNKNOWN.
      IDispatch               ** ppdispVal;      // VT_BYREF|VT_DISPATCH.
      SAFEARRAY               ** pparray;        // VT_ARRAY|*.
      VARIANT                 * pvarVal;         // VT_BYREF|VT_VARIANT.
      PVOID                   * byref;           // Generic ByRef.
      CHAR                    cVal;              // VT_I1.
      USHORT                  uiVal;             // VT_UI2.
      ULONG                   ulVal;             // VT_UI4.
      ULONGLONG               ullVal;            // VT_UI8.
      INT                     intVal;            // VT_INT.
      UINT                    uintVal;           // VT_UINT.
      ECIMAL                 * pdecVal          // VT_BYREF|VT_DECIMAL.
      CHAR                    * pcVal;           // VT_BYREF|VT_I1.
      USHORT                  * puiVal;          // VT_BYREF|VT_UI2.
      ULONG                   * pulVal;          // VT_BYREF|VT_UI4.
      ULONGLONG               * pullVal;         // VT_BYREF|VT_UI8.
      INT                     * pintVal;         // VT_BYREF|VT_INT.
      UINT                    * puintVal;        // VT_BYREF|VT_UINT.
      struct __tagBRECORD {
      PVOID                   pvRecord;
      IRecordInfo             *pRecInfo;
      } __VARIANT_NAME_4;
   } __VARIANT_NAME_3;
  } __VARIANT_NAME_2;
  ECIMAL decVal;
} __VARIANT_NAME_1;
   };

};