Activity Monitor - host entries blank for sql login ?

The activity monitor is not showing entries for hosts which connect via sql logins (odbc), is this normal? Where can I find a list of protocols in which the hostname/ip can be picked up. We're on SQL 2005 SP1/Build 2153

Thanks

The hostname should show up if the user is connecting from a Windows box using ODBC or OLE-DB. If you are using a JDBC driver or comming from a unix machine this field is typically blank. This can be adjusted by adding the "Workstation ID" paramater to the connection string and setting it to equal the client machines host name. This object probably doesn't exist on all drivers. The string name may also be slightly different so some trial and error may be required.|||

The connections in question are from Windows OS (2000/XP) machines, no JDBC or UNIX involved......