Thread:Project:Support desk/How to make a blank page?

Hey, I need an blank page with one simple echo giving some output from an extension. For example: if I got to http://wiki.somenameoftheserver.com/w/index.php?title=Special:SomeSpecialPage&mode=blankpage I want to see a blank page with one line giving some specific output. How can I do that? Or how can I stop to view the rest of the MediaWiki page? Regards, tomabrafix