This function closes the device context identified by hOpenContext.
BOOL XXX_Close( DWORD hOpenContext );
TRUE indicates success. FALSE indicates failure.
An application calls CloseHandle( hFile ) to stop using a stream interface driver. The hFile parameter specifies the handle associated with the device context. In response to CloseHandle, the operating system invokes this function.
The file handle specified for hOpenContext is no longer valid after this function returns; if an application tries to perform stream I/O operations on that handle after calling CloseHandle, those operations fail.