How to send the information data of memory address between processes?

[givesun]

Hello, I'm going through the source code of posh.
I have few questions.

1. I understood the concept of zero copy in iceoryx.
   The huge real data will be stored in shared memory, and Producer will send the only information for memory address to Consumers.
   So There is no actual data copy. But I want to know how to send or receive the address data between processes?
   Regarding this point, Is there any other ipc is being used? For example Unix domain socket or semaphore?

2. Regarding lockfree queue.
   As I know the lockfree-queue is being used for zero-copy.
   If there are 3 modules(roudi-daemon, publisher, subscriber), Each modules has its own lockfree-queue?