Auto fill dates

Continuing with the auto fill alpha characters in Excel or Access - I have a repeating number in a column, need to assign an alpha character sequentially after each row where the numeric value is repeated after the first time it appears. I.E. Column A row 1 = 123, row 2 = 123a, row 3 = 123b etc?

We have a Korky one-piece anti siphon valve (#528) that auto fills our swimming pool. How can it be adjusted?

In Excel, how could I Auto Fill with alpha characters instead of numeric values? I know that I can click on the bottom right-hand corner of a cell until the black + sign appears, and then click and drag to fill the same formula, formatting, etc. Downward or to the right, with numeric values. ...

How do I turn off auto fill in - The thing that fills in all your personal info on web pages with out you doing it?

I entered info on auto fill incorrectly. I cannot figure out how to go back and correct it. Anyone know how to do this? It's a windows vista