The ACTIVATEFLAGS enumeration value indicates whether an object is activated as a windowless object. It is used in IOleInPlaceSiteEx::OnInPlaceActivateEx.
typedef enum tagACTIVATEFLAGS
{
ACTIVATE_WINDOWLESS = 1
} ACTIVATEFLAGS;
Windows NT: Use version 4.0 and later.
Windows: Use Windows 95 and later.
Windows CE: Unsupported.
Header: Declared in ocidl.h.