| GetUpdateRgn(IntPtr, IntPtr, Boolean) | Retrieves the update region of a window by copying it into the specified region. The coordinates of the update region are relative to the upper-left corner of the window (that is, they are client coordinates). |
| GetUpdateRgn(SafeHandle, SafeHandle, Boolean) | Retrieves the update region of a window by copying it into the specified region. The coordinates of the update region are relative to the upper-left corner of the window (that is, they are client coordinates). |