Each service, implicitly or explicitly, also represents the transfer of information between nodes and may be characterized as a message or operation.
每种服务还隐式或显式地表示节点之间的信息传递，并且可能被描述为一个消息或运作。
People in Kenya, for instance, already use a successful text-message-based service called M-PESA to transfer money electronically to other mobile users.
例如，肯尼亚人已经在使用一个以手机短信为基础的成熟的服务- M - PESA，借助该服务可以以电子方式将钱转账到另一部手机上。
International telegraphic message-transfer service consisting of a network of teleprinters.
由电传打字机网络组成的国际电报信息传送服务。
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