On Fri, 09 Mar 2012 10:45:32 +0000, Bernard Peek wrote:
It was WordPerfect. The product existed before the IBM PC and was one of
the first word-processors available for the system. It's possible that
the choice of F3 was inherited from a previous version.

Ah, I didn't realise it was that old - I remember we had Wordperfect for
Unix and I always assumed that had grown out of the PC product, but maybe
it was the other way around...