Thanks very much - fork_jtask_ did exactly what I wanted.
-- Ewart
-- 
Ewart Shaw [J.E.H.Shaw]       http://www.ewartshaw.com [Work in Progress]
    [email protected]       http://www.facebook.com/ewart.shaw
3  ((4&({*.(=+/))++/=3:)@([:,/0&,^:(i.3)@|:"2^:2))&.>@]^:(i.@[)  <#:3 6 2
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