Try <ctrl-n> in insert mode.

Mark Chandler wrote:
> I recently installed vim 7. The only autocomplete I can find it the
> omnicomplete, using CTRL-X CTRL-O. Is there a way to make
> auto-completion automatic, and if not, is there a way to change the
> shortcut so I don't have to hit CTRL-X CTRL-O every time?
>
> Thanks in advance.
> 
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