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| Clients and Servers |  A client uses services (operations) of other object. A server provides services (operations) to other objects.
                      The same object can both act as a client and a server.
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 In a dice game the objects act, in turn, as client and servers.  | 
![]()  |  Interacting Game, Die, and Random objects. The Game object is a client of the Die objects, which in turn are clients of the Random objects.  | 
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 Read more about clients and servers in the text book version of this material.  |