The following constants are used to identify standard bookmarks. For more information about bookmarks, see the OLE DB Programmer's Reference or the Bookmarks section of this SDK.
| Constant | Description |
| BMK_SIZE | Defined as sizeof(BYTE). This is used for the size of all standard bookmarks. |
| BYTE BMK_INVALID | Value of an undefined or invalid standard bookmark. |
| BYTE BMK_CURRENT | Standard cursor bookmark value for the current row. |
| BYTE BMK_BEGINNING | Standard cursor bookmark value for the start of the recordset, before the first row. |
| BYTE BMK_END | Standard cursor bookmark value for the end of the recordset, after the last row. |
| BYTE DBBMK_FIRSTROW | Standard rowset bookmark value for the first row in the recordset. |
| BYTE DBBMK_LASTROW | Standard rowset bookmark value for the last row in the recordset. |