=> R0 = Location flags
R1 = Sprite area (0 for system, 1 for Wimp, otherwise an address)
R2 = Pointer to sprite name
R3 = Pointer to 16-byte block containing drag box
R4 = Pointer to optional block containing bounding box
This SWI starts dragging a sprite. The sprite you supply is copied, so you can dispose of your copy of the sprite if need be.
See PRM 3, page 300.
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