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This Concept Map, created with IHMC CmapTools, has information related to: ch2 arch vari, Variations in distributed systems are Proxy servers and Caches: Data likely to be needed again may be stored in memory or on local for fast retrieval., Variations in distributed systems are Network Computers: All code and data may be stored on a server and moved to a local thin client temporarily for execution. Only the code necessary to retrieve the programs and data is stored on the network appliance., Variations in distributed systems are Mobile clients and spontaneous interoperation: Transient mobile devices such as laptop computers, cell phones and PDAs may connect to the network using technologies such as GSM, 3G, WiFi, and Bluetooth., Variations in distributed systems are Mobile Agents: A running program including code and data may run on remote systems. This may be a security problem, as such agents include worms, viruses, and web crawlers., Variations in distributed systems are Thin Clients: Most of the processing may be done on a remote server, with little more than a client interface, most commonly a Web Browser, running on the client., Variations in distributed systems are Mobile code: Code may be retrieved from a server for execution on a client system. A common example of this is a Java Applet., Variations in distributed systems are Multiple servers: Services with large demands, such as search engines, may have many servers dedicated to a particular task.