What is the difference between Legion and Jini?

Jini is a recently announced Sun software system designed to easily connect any computing device (whether PC, cell phone, or laptop) to a larger network, using Java to distribute processes among the devices connected to the network. Jini allows users to simply plug the devices into the network without having to initialize or restart any part of the system. The device announces and describes itself to the network, so that its resources (memory, display, applications, etc.) can be utilized as necessary by the network.

However, Jini is not middleware and it is not concerned with the underlying communication processes involved in distributed computing. Jini allows devices to communicate on a common network, but it does not handle the actual communications or transferal of data. It is a simple publish/subscribe architecture, and does not concern itself with issues such as fault tolerance, access control, authentication, parallel computing, etc. more.

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