How do I get the Client Computer name

Hello everyone..

Need your expert advise / help on following item..

I am trying to retrive the client's computer name where they are trying to consume ARS. for example, I can get the client computer if they are using MMC using following code..

$ObjSession = $Security.Sessions.Current
$comp = $ObjSession.ClientHost

However, it passes ARS Web Server name for all web interface connections (obviously it's a server side processing).. Is there any way to get client computer information for all Web UI connection?