typedef struct tagALTTABINFO
{
    DWORD cbSize;
    int cItems;
    int cColumns;
    int cRows;
    int iColFocus;
    int iRowFocus;
    int cxItem;
    int cyItem;
    POINT ptStart;
} ALTTABINFO, *PALTTABINFO, *LPALTTABINFO;