Assuming you are asking about dynamically linked library data, typically each process would get its own copy of the data, at least virtually. The operating system could actually use the same RAM to hold this data, though. If the data were then written to by one of the processes the OS would then make a new copy of the data that that process could change and let the other processes keep looking at the old copy.
This is known as Copy On Write (COW).
I assume this is platform specific as there are no such specs in the language.
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