Apps initialize in R12

FND_GLOBAL.APPS_INITIALIZE for initializing session in Oracle Ebusiness suite

FND_GLOBAL.APPS_INITIALIZE is used for initializing the session before calling any public or private API's in Oracle Ebusiness suite. Its not required for all the API's but its recommended that you set this profile before making any calls to either private or public API.

utilize the following query to get the respective values

SELECT fnd.user_id ,
  fresp.responsibility_id,
  fresp.application_id,
  fresp.responsibility_name
FROM fnd_user fnd ,
  fnd_responsibility_tl fresp
WHERE fnd.user_name = 'HCM'
AND fresp.responsibility_name LIKE 'US%';

l_user_id is the fnd user ID
l_resp_id is the responsibility ID
l_resp_appl_id is the responsibility application ID.

EXEC fnd_global.APPS_INITIALIZE(l_user_id,l_resp_id,l_resp_appl_id);
  (OR)
BEGIN
  fnd_global.APPS_INITIALIZE(l_user_id,l_resp_id,l_resp_appl_id);
mo_global.init('appl_shrt_name');
--Ex :: exec  mo_global.init('AR');
END;

/

Another option is Help > Diagnostics > Examine and get the values from $profile session values.

To Initialize session

SELECT fnd_global.session_id,USERENV('sessionid') FROM dual;

INSERT INTO FND_SESSIONS VALUES
  (USERENV('sessionid'),TRUNC(sysdate)
  );