title: How to "click to chat" whatsapp groups or multiple numbers
body: <p>I find the click to chat function of Whatsapp extremely useful. 
  As you all know, it is very simple. Just type:</p>
  
  <pre><code>    https://api.whatsapp.com/send?phone=XXXXXXXXXX&amp;text=example
  </code></pre>
  
  <p>(where XXXXXXXXXX stands for any number starting with country code, without zero or plus, and the rest of the number) in the URL, and the trick is done.</p>
  
  <p>I wonder if there is a way to send the same message to TWO OR MORE numbers at the same time!</p>
  
  <p>Imagine one could type:</p>
  
  <pre><code>    /send?phone=44785XXXXX1&amp;/send?phone=44785XXXXX2 (doesn't work) or
      /send?phone=44785XXXXX1&amp;44785XXXXX2 (doesn't work) or
      /send?phone=44785XXXXX1?phone=44785XXXXX2 (doesn't work) or
      /send?groupID=EXAMPLEGROUPID  (obviously doesn't work).
  </code></pre>
  
  <p>Initially I thought I could make a URL to a separate website with a link containing two window.open bits as in:</p>
  
  <p>onclick="window.open('<a href="https://api.whatsapp.com/send?phone=4478XXXXXX8&amp;text=Hello%20Vanni" rel="noreferrer">https://api.whatsapp.com/send?phone=4478XXXXXX8&amp;text=Hello%20Vanni</a>!','newwin') onclick="window.open('<a href="https://api.whatsapp.com/send?phone=44785XXXXX1&amp;text=Hello%20Vanni" rel="noreferrer">https://api.whatsapp.com/send?phone=44785XXXXX1&amp;text=Hello%20Vanni</a>!','newwin');">click me</p>
  
  <p>but that opens two window or tabs, and is less useful than both numbers being contacted AT THE SAME TIME WITHIN THE SAME TAB, from the same URL.</p>
  
  <p>Do you think this is possible?</p>
  
  <p>Any help is appreciated.</p>