[DirectX 6 Programmer's Reference] Focus and Device Windows (98.9583333333333%)

DirectX Foundation > DirectDraw > DirectDraw Essentials > Multiple Monitor Systems

[DirectX 5 Programmer's Reference] Focus and Device Windows (83.984375%)

DirectX Foundation > DirectDraw > DirectDraw Essentials > Multiple Monitor Systems (New for Windows 98 and Windows NT 5.0)