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Provides an alternative way to invoke the OLE method IUnknown::Release.
Client applications and service providers
The reference count is the number of existing pointers to the object to be released.
If the punk parameter is NULL, the function returns immediately without calling IUnknown::Release
UlRelease returns the value returned by the IUnknown::Release method, which can be equal to the reference count for the object to be released.
For more information about IUnknown::Release, see Implementing the IUnknown Interface.