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Does the FileMaker program assign such numbers automatically upon creation of a record?.
Yes, if your Id field is definited to auto-enter serial mumbers.
FM already have unique record ID - read Help
But they're not unchanging. If you import the records into a new copy of the file, (system update or file was damaged), the record ID will change but the serial number will not as long as you don't enable auto-enter options during import.