title: R install package globally
body: <p>How do I install an R package globally, so it's available to all users? Currently I'm doing</p>
  
  <pre><code>R.exe CMD INSTALL *.zip
  </code></pre>
  
  <p>But it does</p>
  
  <pre><code>* installing to library 'C:/Users/Matt/Documents/R/win-library/2.15'
  </code></pre>
  
  <p>I would like to install the packages alongside R in Windows' 'program files'.</p>