Returns a sql db server's signed in users

WhoIsLoggedIn.sql

SELECT  SESSION.login_name AS 'Database User Name'
       ,MAX(SESSION.login_time) AS 'Login Time'
       ,SESSION.host_name AS 'PC Name'
       ,SESSION.program_name AS 'Program Using'
       ,SESSION.client_interface_name AS 'Interface'
       ,UM.USER_NAME AS 'User'
FROM    master.sys.dm_exec_Sessions SESSION
WHERE   SESSION.session_id >= 51 -- All user Sessions
GROUP BY SESSION.login_name
       ,SESSION.host_name
       ,SESSION.program_name
       ,SESSION.client_interface_name
       ,UM.USER_NAME