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There are questions tagged access, and questions tagged user-access; as far as I know, the term access is always used to refer to user access.
Is there any reason to have both the tags?
Update: As there are node-access and user-access, I don't see any reason to have access, except when it means "file access"; in that case, we should probably have file-access too.
Node access and User access are subtly different, and even within Node access there are two approaches, hook_node_access() and Node Grants. That said, they are closely related, with another assenting opinion I can merge them.