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typedef struct scrollbar
{
  int    minpos, maxpos, currpos;
  int    thumbpos;   /* offset of thumb position from window top-left */
  DWORD  sb_flags;
#define SB_VERT   0x0001
#define SB_HORZ   0x0002
#define SB_HIDDEN 0x0004
#define SB_CTL    0x0008
} SCROLLBARINFO;