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  Name Description
Public field pUnkForRelease Represents a pointer to an interface instance that allows the sending process to control the way the storage is released when the receiving process calls the ReleaseStgMedium function. If pUnkForRelease is a null reference (Nothing in Visual Basic), ReleaseStgMedium uses default procedures to release the storage; otherwise, ReleaseStgMedium uses the specified IUnknown interface.
Public field tymed Specifies the type of storage medium. The marshaling and unmarshaling routines use this value to determine which union member was used. This value must be one of the elements of the TYMED enumeration.
Public field unionmember Represents a handle, string, or interface pointer that the receiving process can use to access the data being transferred.