Wikimedia Bugzilla is closed!

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An entry of the form [[Consciousness:Sandbox]] yields:

<a href="http://teadvus.inspiral.org/index.php/Sandbox" class="extiw" 
title="consciousness:Sandbox">Consciousness:Sandbox</a>

This applies to en.wikipedia.org, el.wikisource.org and probably all others.

Discovered at 
http://el.wikisource.org/w/index.php?title=Περί_Αισθήσεως_και_αισθητών&curid=1373&diff=19487&oldid=19161

It's a normal interwiki link. See http://meta.wikimedia.org/wiki/Interwiki_map

If the link target is no longer correct, you can propose the removal/change
under http://meta.wikimedia.org/wiki/Talk:Interwiki_map