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I've got the Apple drivers for XP installed, and under Parallels' Devices/USB I see and have selected Apple-Composite (although I could have sworn...
Fantastic! Works like a champ - just make sure you see the five little but crucial words - after you RUN THE APP - which I missed, thinking it was...
Although it may seem like the real thing, RC versions are still beta software - no company in its right mind would fully support pre-release...