| Constant | Value | Description |
| ccOLEManual | 0 | OLE drag/drop will be initialized only under programmatic control. |
| ccOLEAutomatic | 1 | OLE drag/drop will be initialized when the user drags "out" of the control, or under programmatic control. |
| ccOLEDropAutomatic | 2 | Accepts an OLE drag/drop without programmatic control. |
| ccOLEDropManual | 1 | Accepts an OLE drag/drop under programmatic control only. |
| ccOLEDropNone | 0 | Accepts no OLE drag/drop operations. |
| ccOLEDropEffectCopy | 1 | A mask to indicate that a copy has taken place/would take place. |
| ccOLEDropEffectMove | 2 | A mask to indicate that a move has taken place/would take place. |
| ccOLEDropEffectNone | 0 | No OLE drag/drop operation has taken place/would take place. |
| ccOLEDropEffectScroll | -2147483648 | A mask to indicate that the drop target window has scrolled/would scroll. |