REGIONDATA
typedef struct tagREGIONDATA
{
   HWND hBitmapWindow;
   LBitmapWindow 
 L_FAR *pClass;
   L_INT nModificationType; 
 
} REGIONDATA, L_FAR * LPREGIONDATA;
| Member | Description | 
| hBitmapWindow | Handle to the bitmap window. | 
| pClass | Pointer to an LBitmapWindow object. | 
| nModificationType | The type of modification made to the region. Possible values are: | 
| Value | Meaning | 
| 0 | The region was created. | 
| 1 | The region was destroyed. | 
| 2 | The region was modified. |