Direct3D Initialization - Introduction to 3D Game Programming with DirectX 9.0 - page 50

PresentationInterval —A member of the D3DPRESENT set.
See the documentation for a complete list of valid intervals. Two
common ones are:
D3DPRESENT_INTERVAL_IMMEDIATE —Presents
immediately
D3DPRESENT_INTERVAL_DEFAULT —Direct3D will choose
the present rate. Usually this is equal to the refresh rate.
An example of filling this structure out is:
D3DPRESENT_PARAMETERS d3dpp;
d3dpp.BackBufferWidth = 800;
d3dpp.BackBufferHeight = 600;
d3dpp.BackBufferFormat = D3DFMT_A8R8G8B8; //pixel format
d3dpp.BackBufferCount = 1;
d3dpp.MultiSampleType = D3DMULTISAMPLE_NONE;
d3dpp.MultiSampleQuality = 0;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.hDeviceWindow = hwnd;
d3dpp.Windowed = false; // fullscreen
d3dpp.EnableAutoDepthStencil = true;
d3dpp.AutoDepthStencilFormat = D3DFMT_D24S8; // depth format
d3dpp.Flags = 0;
d3dpp.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;
d3dpp.PresentationInterval

= D3DPRESENT_INTERVAL_IMMEDIATE;

1.4.4 Creating the IDirect3DDevice9 Interface
With the D3DPRESENT_PARAMETERS filled out, we can create the
IDirect3DDevice9 object with the following method:
HRESULT IDirect3D9::CreateDevice(
UINT Adapter,
D3DDEVTYPE DeviceType,
HWND hFocusWindow,
DWORD BehaviorFlags,
D3DPRESENT_PARAMETERS *pPresentationParameters,
IDirect3DDevice9** ppReturnedDeviceInterface

);

Adapter —Specifies the physical display adapter that we want the
created IDirect3DDevice9 object to represent

DeviceType —Specifies the device type to use (e.g., hardware
device ( D3DDEVTYPE_HAL ) or software device ( D3DDEVTYPE_
REF ))

hFocusWindow —Handle to the window that the device will be
associated with. This is typically the window that the device will
draw onto, and for our purposes it is the same handle that we spec-
ify for the data member d3dpp.hDeviceWindow of the
D3DPRESENT_PARAMETERS structure.