Question about "ul" in termcap

[ajs at hpfcla.UUCP]

Termcap(5) from BSD4.1 (I think) says this about "ul":

>	ul   bool   Terminal underlines even though it doesn't overstrike

>	If your terminal correctly generates	underlined  characters
>	(with	 no  special  codes  needed)  even  though it does not
>	overstrike, then you should give the capability ul.

It's not clear HOW the terminal  should  generate  underline  characters
without special codes.  Are there terminals that can backspace and add a
non-destructive underscore (only)?  Is that what this is intended for?

More(1) avoids processing underscores if "ul" or "os" (overstrike) is in
termcap for the terminal.  Does that make sense?

Thanks in advance for answers by mail!

Alan Silverstein, Hewlett-Packard Fort Collins Systems Division, Colorado
{ihnp4 | hplabs}!hpfcla!ajs, 303-226-3800 x3053, N 40 31'31" W 105 00'43"