Finding out who is logged into what computer ? To find out where user logged in?

Hello Friends :

I want to show you that how can you findout the place which your domain users are logging in ,
Of Course i mean the computer account which the user is using for logging in :

1- The first way is to use a free command line tool called "PsLoggedOn v1.33" you can downlaod it from here:
    http://technet.microsoft.com/fa-ir/sysinternals/bb897545(en-us).aspx

2- The second way is to use a free and open source third pary application called " Kaboodle " :
    http://www.kaboodle.org/index.html

3-The Thirs way is to use a command line tool called "NBTSCAN " you can see a sample trick here :
  
 C:\nbtscan>nbtscan 192.168.0.100-200
 Doing NBT name scan for addresses from 192.168.0.100-200

 IP address       NetBIOS Name     Server    User             MAC address
 ------------------------------------------------------------------------------
 192.168.0.119    SQUASH           <server>  SQUASHMAN        12-34-ba-c0-52-32
 192.168.0.153    BUMBLE-BEE       <server>  BUMBLE-BEE       00-0f-1f-b3-b5-89

 C:\nbtscan>

You can downlaod it from here : http://linux.wareseeker.com/download/nbtscan-1.5.1.rar/334598