Activating proxies???

Question

Hi Experts,
I've gone thru the weblog /people/vijaya.kumari2/blog/2006/01/26/how-do-you-activate-abap-proxies
wherein i'm not getting the clear picture....can anyone explain me why these step are required and wht is the purpose of these steps.
the steps are........
2. Configuration Business system as local Integration Engine.
3. Connection between Business System and System Landscape Directory (again why we need to create RFC dest.)
2. Maintaining the SAP J2EE Connection Parameters for LCRSAPRFC and SAPSLDAPI in SAP J2EE engine
All these configurations will XI developer do or BASIS guys will do
Points will b rewarded for helpful answers
Cheers
Faisal
Edited by: Abdul Faisal on Apr 2, 2008 11:34 AM

Answer 1

Hi Abdul,
1) Connection between Business System and System Landscape Directory (again why we need to create RFC dest.)
A) R3 system is physically existing system hence we need to create the business system in SLD and then u need to import the Business sytem in ID and use that BS in Configuration.
For any scenario dealing with RFC,IDOC and Proxy u need to create the BS and import it and use that in configuration.
2). Maintaining the SAP J2EE Connection Parameters for LCRSAPRFC and SAPSLDAPI in SAP J2EE engine
Answer:
1) LCRSAPRFC
The RFC destination LCRSAPRFC is required for the connection to the System Landscape Directory (SLD). It is used to read the exchange profile.
2)  SAPSLDAPI
The RFC destination SAPSLDAPI is required for the connection to the SLD. It is used by the ABAP API.
http://help.sap.com/saphelp_nw04s/helpdata/en/be/6e0f41218ff023e10000000a155106/frameset.htm
Chirag