title: Cannot create new plotting window (device?) with par(new=T)
body: <p>I want to create a new window for each additional plot in R. I tried</p>
  
  <pre><code>plot(rnorm(20), new=TRUE)
  </code></pre>
  
  <p>and also </p>
  
  <pre><code>par(new=T)
  plot(rnorm(20), new=TRUE)
  </code></pre>
  
  <p>Neither gives me a new window. Do I really need to create a new device?</p>