We present a modal language for distributed computation which addresses the safety of mobile values as well as mobile code. The safety of mobile code is achieved with the modality [] which corresponds to necessity of modal logic. For the safety of mobile values, we introduce a new modality Ο which expresses that given code evaluates to a mobile value. We demonstrate the use of modal types with three communication constructs: remote evaluation, futures, and asynchronous channels. 57 pages

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