title: How to open a link in a specified, open window
body: <p>I have this web application which has integrations into other webapps like <code>Salesforce</code>.</p>
  
  <p>Now I have a link in <code>Salesforce</code> which opens a new window of my application, but I would like it to open the link inside the window, where my webapp is already open.</p>
  
  <p>Scenario:</p>
  
  <ul>
  <li>tab1: mywebapp, tab2: salesforce</li>
  <li>click link in tab2: link opens in tab3 (link should open in tab1)</li>
  </ul>
  
  <p>I've looked into <code>target</code> attribute of links, but they only target named frames and I'm not sure how I could name <code>tab1</code> to be a valid target.</p>
  
  <p>Any other hints people can give me?</p>
  
  <p>Edit:</p>
  
  <p><code>tab1</code> already exists, so I can't actually do the 'open a new window with a name' thing. I'd somehow have to either make <code>tab1</code> have a name through code (tab1 is opened via URL)</p>