Just keep a list of the aliases you used when you opened the tables, say
in an array aTables, or a collection,and when you want to close them
iterate through the list and do something like:

for i = 1 to alen(aTables, 1)
  use in select(aTables[i])
endfor

If the alias is opened, it'll close it. If not, no errors or anything
will happen, it will just continue. No type checking or any further
complication required.

-- 
  Alan Bourke
  alanpbourke (at) fastmail (dot) fm

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