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>I personally would like to search other tables if a global cannot be found
>before returning nil.

How about this?

 settagmethod(tag(nil),"getglobal",function (name)
  return T1[name] or T2[name] or T3[name]
 end)

This searches "name" in tables T1, T2, T3 before returning nil.
(Just make sure that T1, T2, T3 are defined or you'll get loops.)
--lhf