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I have made a start on drafting a manual for absolute beginners - it has barely got to grips with OpenMx as yet, but I will attach it as far as it has got, and would welcome comments (and some help in the places where I have indicated that I have got stuck).
SMB attachment updated on 7th March
Further update on 10th March, but can't add it as it exceeds disk quota. Email firstname.lastname@example.org if you would like a copy.