How to differentiate

Hi There,
What are the different ways to find the following?
1)how many dialog instances are present and what are they?
2)how do you identify which is a central instance?
3) how do you start and stop all of them?

I am pretty new to basis too. So here are some ways to check for Central Instance or Dialog Instance that I know of. There might be more.
1.how many dialog instances are present and what are they?
Tcode SM51should list all the instances i.e. Central and the Dialog Instances connected to the Central Instance
2. how do you identify which is a central instance?
The instance on which the Message Server is running is the Central Instance. This can also be checked from the OS side by going to /usr/sap/<SID>/<Instance>
For the Central Instance, this would have DVEBMGS which are the services running on it. M here stands the Message Server, which means that it is the CI.
The DI would not have M on it.
I guess the same applies for the D ie Dispatcher as well which runs on the server that runs the Message Server. Im not sure about this point though.
3.how do you start and stop all of them?
Start by starting the CI first and then all the Dialog Instances one by one.
Stop by stopping all the DIs and then finally the CI.
Incase you are not sure of the commands,
startsap all
stopsap all
Let me know if you need more info on the commands

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