how to understand multi-copy atomicity and who is in charge to maintain this property

hi,

the concept of multi-copy atomicity always troubles me , so could you kindly help to answer the three questions:

#1 how to understand multi-copy atomicity ?

#2 who is in charge to maintain multi-copy atomicity in soc system ,interconnect or other components ,like cpu?

#3 how to maintain this property ?

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