Javascript - Void Keyword

<head>
   <script type = "text/javascript">
      <!--
         void func()
         javascript:void func()
         or:
         void(func())
         javascript:void(func())
      //-->
   </script>
</head>

<html>
   <head>     
      <script type = "text/javascript">
         <!--
         //-->
      </script> 
   </head>
 
   <body> 
      <p>Click the following, This won't react at all...</p>
      <a href = "javascript:void(alert('Warning!!!'))">Click me!</a>   
   </body>
</html>

<html>
   <head> 
      <script type = "text/javascript">
         <!--
         //-->
      </script>     
   </head>
 
   <body> 
      <p>Click the following, This won't react at all...</p>
      <a href = "javascript:void(0)">Click me!</a>     
   </body>
</html>

<html>
   <head>     
      <script type = "text/javascript">
         <!--
            function getValue() {
               var a,b,c;
             
               a = void ( b = 5, c = 7 );
               document.write('a = ' + a + ' b = ' + b +' c = ' + c );
            }
         //-->
      </script>     
   </head>
 
   <body>
      <p>Click the following to see the result:</p>
      <form>
         <input type = "button" value = "Click Me" onclick = "getValue();" />
      </form>   
   </body>
</html>

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