[Groff] how not to number the cover page? and not to show page number on the front page?

[Anton Shterenlikht]

I'd like to make a cover page with mm .COVER/.COVEND.
How can I not number it, i.e. start numbering pages
only from the following (front) page?

Also, ideally I don't want to show the number on
the front page. How to do this?

As an illustration, I'd like to have the page
numbering as in here:

http://www.kohala.com/start/troff/v7man/trofftut/trofftut.ps

Thanks

Anton