What does "deal with" here mean, please?
"This definition has several important aspects. The first one is that a distributed system consists of components (i.e., computers) that are autonomous. A second aspect is that users (be they people or programs) think they are dealing with a single system. This means that one way or the other the autonomous components need to collaborate. How to establish this collaboration lies at the heart of developing distributed systems."
eg . A second aspect is that users . .
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eg . A second aspect is that users . . . think they are using a single system.