"target" is not a URL parameter, it is an option of a link-element <a>. I ment setting the $conf-parameter using the admin-panel (see attached image).
By the way, when you set external links to be opened in a new tab/window (like i did im my example) you could simply usw the browser-URL of the target-page and paste it as external link, e.g.
[[http://appsrv03/wiki/doku.php?id=technik:funktionsbeschreibungen:typenliste]]
Nearly the same is done if using interwiki links (
https://www.dokuwiki.org/interwiki). If you add this line to
conf/interwiki.local.conf:
newtab http://appsrv03/wiki/doku.php?id=
You could use the following syntax to open new tab, which is noch far from the regular internal wiki link:
[[newtab>technik:funktionsbeschreibungen:typenliste]]