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>I was wondering if it was possible from standard lua to set the global
>environment to another table prior to a dofile(), then kill the temp one
>and restore the main?

Sure. In Lua 4 do

        do
        local newG={ fill here with what is needed in the sandbox }
        local oldG=globals(newG)
        oldG.dofile(xxx)
        oldG.globals(oldG)
        end
Thanks for the tip... I had problems with this at first until I realized I had to put all the functions I wanted to use into the new environment like: 

do
        local newG = {}
        newG.write = write


oops, the following line:


        newG._OUTPUT = write


should have been:
        newG._OUTPUT = _OUTPUT


        newG._ERRORMESSAGE = _ERRORMESSAGE
        newG._ALERT = _ALERT
        local oldG = globals(newG)
        oldG.dofile(xxx)
        oldG.globals(oldG)
end


-joe