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Hello everyone, Thanks for all the replies. I guess I'll use whatever is handier at the moment: tuples/lists when the amount of change in the structure of the state is low, records otherwise... Thanks! -- Matheus Degiovanihttp://www.tilt.net http://clubtilt.net "Nem mesmo os sábios conseguem enxergar os dois lados" - Gandalf em O Senhor dos Anéis de JRR Tolkien.