It's like an add-on memory tool. If you don't remember the ad, it wasn't any good.
Play with words 2. "Links" in german means "left" and is used for Internet-links (URLs) as well.
"LINKS AUSSEN" is the "left forward" in a football-team.
On the left of the ad is a link to the best-priced DSL provider: www.lycos.dsl.de
Published in a football-magazine.