From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Thu, 31 Jul 2014 16:30:01 +0200
From: Carsten Kunze <carsten.kunze@arcor.de>
To: 9fans@9fans.net
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Subject: Re: [9fans] troff documentation link broken
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> Please remember that the document applies to both nroff and troff.
> For nroff (terminals, printers), .ul does underlining. For typesetters
> (includes laser printers) troff .ul does italics. The .us macro shows
> how to get real underlining on a typesetter device.

Please read that paragraph carefully.  The "such that" means, that the above defined macros are (should be ;) used.  Also the shown output ist typeset, and not shown as typewritten with a CW font.  That is simply a typo...

> Evolution plays a part here. The original formatter was nroff for
> printers and teletypes. Troff came along later, at which point .ul
> was already in use in people's documents and/or macro packages.

That is well-known of course ...