Keystroke to fill formula in cells below without highlighting

[sheetspread]

I couldn't find this on google but read about it somewhere:

I have filled columns and enter a formula in the adjacent column(s). How do I copy that formula down only as far as there are filled adjacent cells? There's a keystroke that lets you do this without highlighting or ctrl-down arrow or shift.

 

[Joe4]

Don't know about a keystroke, but double-clicking on the lower right hand corner of the cell works.

 

[sheetspread]

Even better, thanks Joe!