A while back I read Thomas Gries' paper Getlets: extending the interwiki concept beyond any limits http://meta.wikimedia.org/wiki/Transwiki:Wikimania05/Workshop-TG3 and was quite intrigued by the idea. Since then, I have used the TWiki facility for arbitrary URL inclusion to (for example) use a PHP script to generate content for TWiki pages. However, the Getlets page on SourceForge http://sourceforge.net/projects/getlets/ doesn't contain any content, so I'm not sure how to proceed in using this sort of technique in MW. Is there a facility for arbitrary URL inclusion in MW? Pointers and suggestions welcome...