"Dispatchers" parameter in dedicated mode

Hello,
I've noticed that the "dispatchers"' parameter in dedicated mode looks like this (on 10.2.0.1.0 db) :
dispatchers=(PROTOCOL=TCP) (SERVICE=sidXDB)
What is the SERVICE parameter for, and why is it set to this default value in dedicated mode ?
Is the SERVICE parameter always set for dedicated servers only ?
Otherwise, how can I recognize dedicated and shared mode when I look at the insatnce parameters ?
thank you
Regards,
Antoine

Actually you can configure a instance to use dedicated server mode and shared server >mode at the same time: it's up to the client to connect using the right configured service >that will make the right mapping.You are right Pierre.
But I've tried to configure several instances with DBCA wizard, both in dedicated and shared mode :
- when dedicated mode is selected, dispatchers parameter is set like this : "dispatchers=(PROTOCOL=TCP) (SERVICE=sidXDB)", and all connections at the instance will be in by default dedicated mode, even if the "shared_servers" parameters is greater than 0
- when shared mode is selected, dispatchers parameter is set like this : "dispatchers=(PROTOCOL=TCP)"
I thought that the instance would run automatically in shared mode if the "shared_servers" parameters is greater than 0, but that's untrue
Besides, I don't understand the link between the "(SERVICE=sidXDB)" option, which seems to be related to the XML database, and the connection mode to the instance.
This is quiet confusing to me, there is obviously something I don't know or I don't understand

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