typedef struct _DDSURFACEDESC2{    DWORD               dwSize;                 // size of the DDSURFACEDESC structure    DWORD               dwFlags;                // determines what fields are valid    DWORD               dwHeight;               // height of surface to be created    DWORD               dwWidth;                // width of input surface    union    {        LONG            lPitch;                 // distance to start of next line (return value only)        DWORD           dwLinearSize;           // Formless late-allocated optimized surface size    } DUMMYUNIONNAMEN(1);    union    {        DWORD           dwBackBufferCount;      // number of back buffers requested        DWORD           dwDepth;                // the depth if this is a volume texture     } DUMMYUNIONNAMEN(5);    union    {        DWORD           dwMipMapCount;          // number of mip-map levels requestde                                                // dwZBufferBitDepth removed, use ddpfPixelFormat one instead        DWORD           dwRefreshRate;          // refresh rate (used when display mode is described)        DWORD           dwSrcVBHandle;          // The source used in VB::Optimize    } DUMMYUNIONNAMEN(2);    DWORD               dwAlphaBitDepth;        // depth of alpha buffer requested    DWORD               dwReserved;             // reserved    LPVOID              lpSurface;              // pointer to the associated surface memory    union    {        DDCOLORKEY      ddckCKDestOverlay;      // color key for destination overlay use        DWORD           dwEmptyFaceColor;       // Physical color for empty cubemap faces    } DUMMYUNIONNAMEN(3);    DDCOLORKEY          ddckCKDestBlt;          // color key for destination blt use    DDCOLORKEY          ddckCKSrcOverlay;       // color key for source overlay use    DDCOLORKEY          ddckCKSrcBlt;           // color key for source blt use    union    {        DDPIXELFORMAT   ddpfPixelFormat;        // pixel format description of the surface        DWORD           dwFVF;                  // vertex format description of vertex buffers    } DUMMYUNIONNAMEN(4);    DDSCAPS2            ddsCaps;                // direct draw surface capabilities    DWORD               dwTextureStage;         // stage in multitexture cascade} DDSURFACEDESC2;typedef struct _DDSURFACEDESC2          FAR *LPDDSURFACEDESC2; 

quote:What is a DWORD ? Is it the same as four chars ?? or one int ??
and how big is one LONG ? and DDCOLORKEY and DDSCAP ... mmm