title: Searching in descriptions of available R packages
body: <p>I was searching for "DDE" phrase in list of all available packages, but found nothing, because output of <code>available.packages()</code> doesn't contain packages descriptions.
  The package I was searching for is <code>tcltk2</code> which <a href="http://cran.r-project.org/web/packages/tcltk2/index.html" rel="nofollow">description</a> is :   </p>
  
  <p><em>"A series of additional Tcl commands and Tk widgets with style and various functions (under Windows: <strong>DDE</strong> exchange, access to the registry and icon manipulation) to supplement the tcltk package"</em>        </p>
  
  <p>and on the <a href="http://cran.r-project.org/web/packages/available_packages_by_name.html" rel="nofollow">web page with all CRAN hosted packages</a> we have only very short one :   </p>
  
  <p><em>"Tcl/Tk Additions"</em></p>
  
  <p>so simple <code>CTRL+F</code> doesn't find it there. How to search packages with "DDE" in its description (eition after  <strong>Sean Hughes</strong> comment):<br>
  1. Is it online resource for that ?<br>
  2. Is there programmatic solution (based on R and without connecting to online search engines) ?</p>