Simple service / reply step and OR join

Hi everyone,

-i’m trying to understand what’s the matter of the reply step and how to use it? The “Response to” property must mention a receive step in the same process… if I want to reply, it’s to a receive step in another process…

Where to place the receiver using simple service protocol? does it call another process synchronously? how to get the response?
I tried several things but I cant use this.

-One other thing is the synchronized OR join. Its behaviour is like the AND one. Normally, the first incoming transition causes the process to continue and the others are ignored but in practice, it doesn"t do that. It waits for all the transitions.

If someone could help me a bit, I would really appreciate it.

Have a nice day.