Documenting VBA code for Excel Auto Complete

Question

When writing a custom function to use in excel using VBA, How to write the documentation comments so that the excel automatically displays during auto-fill of a formula?

Answer 1

I've seen this question a few times, and so far no answer has been provided.

I'm afraid it's just not possible (at least for Excel 2007, not sure about 2010).

Answer 2

I believe you must use Application.MacroOptions to register your function and its description, and optionally provide a help file to make the Help on this Function link work.

Not sure how to provide inline description for the parameters though.