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Only if I can convert it to a number. Think generating session ids for a browser. Surely a reference won't do. A reference value reoccurs every 2^82 calls whereas if I hash it I'll get a value below 2^32 so hashing does not seem to the way to go. On Aug 18, 2005, at 4:58 PM, Rick Pettit wrote: > Will a plain old ref work, the kind returned by erlang:make_ref()?