// Initialize Direct3D device LPDIRECT3DDEVICE9 pDevice; pDevice = InitializeDevice(); // Render the scene RenderScene(pDevice); // Present the content to the screen pDevice->Present(NULL, NULL, NULL, NULL);In this example, the LPDIRECT3DDEVICE9 Present function is called after the scene has been rendered by the RenderScene function. The parameters that are passed to LPDIRECT3DDEVICE9 Present include NULL values for the source and destination rectangles, as well as for the override window handle and the dirty region. LPDIRECT3DDEVICE9 Present is a member of the Direct3D 9 package library, which is included in the DirectX SDK. This library provides a set of functions and tools for graphics and multimedia development on Windows platforms.