How to check online FND_USERS in Oracle EBS R12

SELECT DISTINCT icx.session_id, icx.user_id, fu.user_name, fu.description
FROM icx_sessions icx, fnd_user fu
WHERE disabled_flag != 'Y'
AND icx.pseudo_flag = 'N'
AND ( last_connect
+ DECODE (fnd_profile.VALUE ('ICX_SESSION_TIMEOUT'),
NULL, limit_time,
0, limit_time,
fnd_profile.VALUE ('ICX_SESSION_TIMEOUT') / 60
)
/ 24
) > SYSDATE
AND icx.counter < limit_connects
AND icx.user_id = fu.user_id