Roger, thank you for the excelent explanations. I had no idea about "programme" and "running order"; or the concepts never sunk in when I read them previously.

But two things left me curious. You mention "'ignore as child' or 'select percentage' or whatever". Are these functions documented anywhere? What do they do, specifically?

The other curious thing, I'll reply to cushman's for that.
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens, Greenlights Lit Buttons green set