Netweaver application server differen

[vds]

Hey guys. I have a question about the netweaver application server.

I dont understand the difference between sap abap dispatcher ( not the web dispatcher) and message server. Message server looks which application server have howmany traffic? But dont execute anything. It has only information about the traffic. And this infos give the message server to the abap dispatcher. The abap dispatcher decide then, on which application server the user can logon and work with this as.

Is this explanation right?

Thx

[mercedes_fernandez]

Hello,

the message server performs the following tasks in the SAP system:

- Central communication channel between the individual application servers (instances) of the system

- Load distribution of logons using SAP GUI and RFC with logon groups

- Information point for the Web Dispatcher and the application servers (each application server of the system firsts logs on to the message server)

When an instance is started, the dispatcher process contacts the message server so that it can announce the services it provides (DIA, BTC, SPO, UPD, and so on).
There is one message server per SAP system and a dispatcher process per SAP instance.

Best regards,
Mercedes