usDrop (USHORT)

Drop indicator.

DOR_DROP

Object can be dropped. When this reply is given, usDefaultOp must be set to indicate which operation is performed if the user should drop at this location.
DOR_NODROP
Object cannot be dropped at this time. The target can accept the object in the specified type and format using the specified operation, but the current state of the target will not allow it to be dropped on. The target may change state in the future so that the same object may be acceptable.
DOR_NODROPOP
Object cannot be dropped at this time. The target can accept the object in the specified type and format, but the current operation is not acceptable. A change in the drag operation may change the acceptability of the object.
DOR_NEVERDROP
Object cannot be dropped. The target cannot accept the object now and will not change state so that the object will be acceptable in the future. If this response is returned, no more DM_DRAGOVER messages will be sent to the target until the pointer is moved out of and back into the target window.

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