http://duckduckgo.com/%|%DuckDuckGo%|% is a search engine that accepts plugins contributed by the community to provide "instant answers" for certain domain-specific queries. See http://duckduckhack.com/%|%DuckDuckHack.com%|% for more information about developing plugins for DuckDuckGo.

I created a plugin called tcl_ref[https://github.com/anoved/zeroclickinfo-fathead/tree/master/tcl_ref] which displays syntax synopses and command descriptions from the Tcl/Tk 8.5 manual pages in response to queries that mention "Tcl" and a recognized command name.

Here is an example. A query for "Tcl upvar" returns this syntax summary, which links directly to the corresponding manual page[http://www.tcl.tk/man/tcl8.5/TclCmd/upvar.htm]:

[http://farm8.staticflickr.com/7263/7562145844_422833f1b7_b.jpg]

(Other normal search results appear below this summary.)

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The plugin is a first effort. I invite anyone who is interested in improving the plugin to fork it on GitHub and submit the improvements to DuckDuckGo.