What's New In DirectSetup For DirectX 5?
DirectSetup now supports a callback function that provides notification of various types of events that occur during the setup of DirectX. This allows developers to customize the setup interface. For details, see Customizing Setup With the DirectSetup Callback Function.
Also new in this version of DirectSetup is the ability of DirectPlayLobby applications to remove registration information. For details, see DirectXUnRegisterApplication.