| b10 | b16 | field | type | size | bitfield | comments |
| 0 | 0 | ibkf | short | index to BKF entry in plcfbkf that describes the beginning position of this bookmark in the CP stream. If the bkl.ibkf is negative, add on the number of bookmarks recorded in the hplcbkf to the bkl.ibkf to calculate the index to the BKF that corresponds to this entry. |