Searching the archives, I found an interesting comment [1]: "I think the UUIDGenerator in the image produces UUIDs which are good enough for MC. " - Levente Uzonyi I am pretty well confused by UUIDs in general (they seem magical) and Pharo's implementation. The use case I have in mind is a file library which imports files into a single folder, but changes their names to something guaranteed to be unique so that they don't overwrite each other. Would UUIDs work in that case? Would the image ones be "good enough"? Are primitive-generated UUIDs guaranteed to always be unique if, say, I move the image to another OS and continue generating them with another VM? Thanks! [1] http://forum.world.st/UUID-and-Cog-tp2955687p2957172.html ----- Cheers, Sean -- View this message in context: http://forum.world.st/UUIDs-tp4842189.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.