In terms of C++11, does communication within a network establish a "happens-before" connection?

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No, communication within a network does not establish a "happens-before" connection. "Happens-before" is a term used in the context of multi-threading, where it refers to the order of events within a single thread that can be reliably observed by other threads. In a networked system, events can occur across multiple threads, processes, and machines, making it difficult or impossible to establish a strict "happens-before" relationship between them. Instead, various synchronization mechanisms such as locks, semaphores, and message passing are used to coordinate the actions of different components in the system.