What are the differences between application server and
central instance?

Answer Posted / robin

CI contains Message service and Enque service but also
having Dialog, V1 and V2, Spool and BTC

But App. will not have the Message and Enque

App. server requires only when there is a concept called
logon load balance....without which there will be no use
with App.server.

All the time when the user try to loggin into SAP by using
logonpad, the user will get connect to CI only, since CI
contains Message Server, it will redirect the user request
where the resource available, means where the more dailog
processes are in waiting state.....whether in APP1 or APP2.

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