struct DBGKD_SET_INTERNAL_BREAKPOINT32

typedef struct _DBGKD_SET_INTERNAL_BREAKPOINT32
{
     ULONG BreakpointAddress;
     ULONG Flags;
} DBGKD_SET_INTERNAL_BREAKPOINT32, *PDBGKD_SET_INTERNAL_BREAKPOINT32;

Windows Vista Kernel Structures