I received the following form Sjoerd Hiemstra on the SuSE Linux mailing list:

> Assuming you're in X, you can use the Compose key.
> In SuSE Linux, this is the right Ctrl key by default.
> Examples, assuming that the character set is ISO 8859-1:
>
> ð = <Compose> d- (or -d, etc.)
> Do not keep the Compose key pressed while typing d-.
> æ = <Compose> ae
> é = <Compose> e'
> þ = <Compose> th
> Þ = <Compose> TH
> á = <Compose> a'
> ö = <Compose> o"
>
> See /usr/X11R6/lib/X11/locale/iso8859-1/Compose
> and man iso-8859-1.
> To assign Compose to another key, have a look at the hints given in
> ~/.Xmodmap.

I discovered that the righthand <win> key is the one that works as <Compose>
on my system. I hope this may be of help to others. It may be useful to
have such information available on the web site.

Steven