OK, I don't think you will find any good solutions for that workflow. You would need to be running an application event watcher that tests the preceding words every time you press any key. This would chew up enormous resources and is not worthwhile.

That said, the spell checker works with a very similar workflow to show you the little red squiggly underlines on words it has tested against a dictionary so you can right-click to make your corrected selection. If Microsoft's developers can do it then perhaps someone else can too.

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Andrew Lockton
Chrysalis Design, Melbourne Australia