Hello,
You could use interwiki's for that [1] so you can write
[[:wikipedia:Article]] and the link will forward you to Wikipedia.
I believe the interwiki Wikipedia is set up by default so
[[wikipedia:Article]] will already work
[1]
http://www.mediawiki.org/wiki/Interwiki
--
Huib "Abigor" Laurens
Tech team
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