You mean auto refresh the page? you can use javascript
<script language="JavaScript">
var d = new Date();
document.write(d.getTime()); //this will display the time, just for the test of reload
setTimeout('window.location.reload(true)', 3);
</script>
or html meta tag, make the refresh url to itself.
Use server side php sleep() and then javascript window.location.reload(true); will be ok too. But the browser will show that it is forever downloading.