Is there an auto incrementing number field?

I'm looking through the 6.5 specs, and wondering if there is an
Auto-Incrementing field in this release?

of if not, is there a way of achieving this end? So that as I add a new
record to a table, it's '#ID' for example is automatically added. 1, 2, 3,
4,... and so on

thanks
Bob

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