In the standard direct manipulation protocol, DrgDrag does not return until the drag set is dropped on a target window. Pickup and Drop is slightly different, and requires a change in the handling of a Drop. Because the operation is non-modal, DrgLazyDrag returns as soon as it has completed drag initialiation and before a drop is performed. In the Pickup and Drop protocol, DM_DROPNOTIFY is posted to the source window as notification of a drop. The parameters of this message contain the pointer to the DRAGINFO data structure allocated by the source window and the handle of the target window. The source window should examine the mp2 parameter to determine if the target window and the source window are the same; if not, the source should free the DRAGINFO upon receipt of this message. Where the target and source are the same, the target window frees DRAGINFO after completing the post-drop conversation. The implementation of Pickup and Drop does not affect any of the existing post-drop conversation messages.

The DM_DROPHELP message is not supported for the Pickup and Drop protocol, because help could be requested for any subject at any point during the operation. If the application is to provide Drop help, it must do so from a menu choice and explicitly code the support to be provided.