Returns a handle to the file mapping object that backs this shared buffer. The returned handle is owned by the shared buffer object. You should not call CloseHandle on it. Normal app should use Buffer or OpenStream to get memory address or IStream object to access the buffer. For advanced scenarios, you could use file mapping APIs to obtain other views or duplicate this handle to another application process and create a view from the duplicated handle in that process to access the buffer from that separate process.