This question [Add a version number to the title of a LaTeX document](https://stackoverflow.com/questions/2633986/add-a-version-number-to-the-title-of-a-latex-document) spurred my curiosity:

How do you add an auto-version number in Latex?

( So one is not doing this: `{\bf Version:} 1.2` and then later `{\bf Version:}` 1.2 `1.3`) ?