Check the number or EBS users currently logged in ?

select last_connect, usr.user_name, resp.responsibility_key, function_type, icx.*
  from apps.icx_sessions icx
  join apps.fnd_user usr on usr.user_id=icx.user_id
  left join apps.fnd_responsibility resp on resp.responsibility_id=icx.responsibility_id
  where last_connect>sysdate-nvl(FND_PROFILE.VALUE('ICX_SESSION_TIMEOUT'),30)/60/24
    and disabled_flag != 'Y' and pseudo_flag = 'N';