charecter reapeat

when I enter a word in a cell, then move to another cell in the same column
and type the first letter of the original word, the word automatically
appears. What is this called and how come sometimes it stops working? After
it stops, how do you get it started again?

"imh" <[email protected]> wrote in message
news:[email protected]...
> when I enter a word in a cell, then move to another cell in the same
> column
> and type the first letter of the original word, the word automatically
> appears. What is this called and how come sometimes it stops working?
> After
> it stops, how do you get it started again?

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David Biddulph