To get some idea about central instance, dialog instance, load balancer etc

Hi,
I want to get some idea about central instance, dialog instance, load balancer, cluster nodes etc.
can any one help with some links or blogs or docs.
Thanks
Jhansi

Hi jhansi
Follow this pdf this will answer all your questions
http://help.sap.com/search/highlightContent.jsp
also this is a very good book on ABAP which contains answer of your all questions
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCABA/BCABA.pdf
Thanks
Sandeep
PS: if helpful kindly reward points

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