When developing an MFC application, under what circumstances might you need to call the Win32 API

When developing an MFC application, you might need to call the Win32 API directly when
you need to access system functionality at a fairly low level. For example, if you were
developing a utility to modify user accounts on a network, you would be required to use
the Win32 networking functions because no MFC classes that provide access to Windows
NT network management functions exist.