joomla2.5 - Auto closure of process in task manager using php on server -

how auto closure of process in task manager using php on server?

i have use below script auto closing of ie browser tab while running cron using task manager,

<script type='text/javascript'>     var win = window.open("","_self"); /* url = "" or "about:blank"; target="_self" */     win.close(); </script> 

but ieexplorer.exe process not ending in task manager on server side ending on local host.

can explain how end process or auto close ie tab on server using php?