title: Javascript cross window interaction
body: <p>I have this very simple Javascript to write on a text area when the link is clicked:</p>
  
  <pre><code>&lt;head&gt;
  &lt;script language="javascript" type="text/javascript"&gt;
      function addtext(text) {document.form.textarea.value = document.form.textarea.value+= text;}
      &lt;/script&gt;
  &lt;/head&gt;
  
  &lt;body&gt;
  &lt;form action="" method="" name="form"&gt;
     &lt;textarea name="textarea" rows="" cols="" wrap="wrap"&gt;&lt;/textarea&gt;
  &lt;/form&gt;
  &lt;a href="javascript:addtext('q');"&gt;q&lt;/a&gt;
  &lt;/body&gt;
  </code></pre>
  
  <p>Now I want to up the ante.</p>
  
  <p>What I want to do is have the form in another another window, and that when I click the link, I writes to a textarea in another window.</p>
  
  <p>I'm not necessarily asking for the code because I realize this might be quite complicated. </p>
  
  <p>The question would be where to start, because I haven´t got a clue!!
  (when I Google cross window or cross domain interaction with Javascript I don't really get anything useful).</p>
  
  <p>So any help I can get, libraries, plugins or whatever might guide me in the right direction is more than appreciated.</p>