| Microsoft DirectX 8.1 (Visual Basic) | 
Defines the maximal rate at which frames can be presented to the output.
Enum CONST_D3DPRESENT_RATE_FLAGS
    D3DPRESENT_RATE_DEFAULT   =          0
    D3DPRESENT_RATE_UNLIMITED = 2147483647 (&H7FFFFFFF)
End Enum
One of these flags may be specified in the FullScreen_RefreshRateInHz member of D3DPRESENT_PARAMETERS.