title: How to specify the package when looking up a help reference page for a function?
body: <p>How does one look up the help manual page for a function and specify the package in R? For example, count appears in both seqinr and plyr. If I want to look up count in plyr, what's the command? I've tried a few obvious (but wrong) guesses such as "?plyr::count" </p>
  
  <p><strong>EDIT:</strong>
  When I do ?count, I get the following message:</p>
  
  <pre><code>Help on topic 'count' was found in the following packages:
  
    Package               Library
    plyr                  /Library/Frameworks/R.framework/Versions/2.15/Resources/library
    seqinr                /Library/Frameworks/R.framework/Versions/2.15/Resources/library
  </code></pre>
  
  <p>When I do ?plyr::count, I get:</p>
  
  <pre><code>No documentation for 'plyr::count' in specified packages and libraries:
  you could try '??plyr::count'
  </code></pre>
  
  <p>When I do ?plyr:::count, I get:</p>
  
  <pre><code>No documentation for 'plyr:::count' in specified packages and libraries:
  you could try '??plyr:::count'
  </code></pre>
  
  <p>Adding two question marks also gets me a no documentation found error as well. Looking up help for non-ambiguous funcitons is working fine (e.g. ?plot)</p>
  
  <p>This is with R 2.15.0 on OSX running in emacs + ESS.</p>