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UID, UUID and serialVersionUID

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After "Reading TFM" I am still unclear about the difference between...

- java.util.UUID (http://download.oracle.com/javase/1.5.0/docs/api/java/util/UUID.html)
- java.rmi.server.UID - (http://download.oracle.com/javase/1.5.0/docs/api/java/rmi/server/UID.html)
- serialVersionUID (from the serializable interface) (http://download.oracle.com/javase/1.5.0/docs/api/java/io/Serializable.html)

Could someone please compare the two classes, how they are used and how they relate to the serialVersionUID?
Any insight would be great!!!

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