Is there such a programe??

From: shawnlee zang (pandachina2001_at_yahoo.com)
Date: 09/29/03 

Date: Mon, 29 Sep 2003 09:53:56 +0800

hi all:
   is there such a monitor programe,which can display how many user logged
in,and who logged in,and up's date ,etc.
                                                 thank you