FND_GLOBAL PACKAGE

Recently i come accross a requirement to capture the requestidof the concurrent with in the concurrent program session...Even i am aware of the FND_GLOBAL package...But it didnt strike'at first go.....so i am writing this article for people who are not even awarethat this package exists..
FND_GLOBAL package gives the most of the enviroment values
THis package should be used in database side only...use FND_PROFILE package to get these values in Forms.
1.FND_GLOBAL.USERID --Returns userid

2.FND_GLOBAL.APPS_INTIALIZEprocedure APPS_INITIALIZE(user_id in number,resp_id in number,resp_appl_id in number);
This is used to set the values userid and responsibilityid for a session
3.FND_GLOBAL.LOGIN_ID -Gives login id
4.FND_GLOBAL.CONC_LOGIN_ID--Not sure how to use this
5.FND_GLOBAL.PROG_APPL_ID--Concurrent program application id
6.FND_GLOBAL.CONC_PROGRAM_ID--Concurrent program id
7.FND_GLOBAL.CONC_REQUEST_ID (Server)This will give the concurrent request id of the program which is calling the plsql package..

ln_Request_id:=FND_GLOBAL.CONC_REQUEST_ID;