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7DS System 7DS stands for “Seven Degrees of Separation", a variation on the “Six Degrees of Separation'' hypothesis, which states     that any human knows any other by six acquaintances or relatives.  There is an analogy with our system, particularly, with     respect to data recipients and the device with the original copy. 7DS enables mobile devices to discover each other and communicate even in the absence of a global connection such as Internet or cellular network. 7DS exploits nodes’ mobility for information dissemination and resource sharing in mobile disruption-tolerant networks. 7DS’s modular architecture facilitates application development for the end user by hiding networking details. In addition to provide an application development platform, 7DS offers variety of applications for disruption-tolerant networks. These applications, specifically designed to cover a broad range of communication requirements in mobile disconnected environments, include file synchronization, bulletin board system, email and web query.