What exactly is InheritableThreadLocal Storage, and how exactly do I use it

What exactly is InheritableThreadLocal Storage, and how exactly do I use it?

What exactly is InheritableThreadLocal Storage, andI have only seen one previous use of ThreadLocal objects and it was somewhere on http://www.javaworld.com on a solution to the Java double-checked locking problem.
Roughly speaking, previously to Java1.2 you had two variable-type choices in Java. The first is a static variable that is the same across ALL instances of a class. The second was an instance variable, that is can be different in EVERY instance of a class. Java 1.2 introduced the ThreadLocal variable-type. If a variable type is ThreadLocal, then every running Thread may see a different value for the variable - essentially it is a Map of Threads to values.
InheritableThreadLocal is finely different from ThreadLocal. They are almost identical excepting that if one Thread is spawned from another (ie. it is a "child" thread) then the value of the InheritableThreadLocal variable will be the same in the child Thread as the parent Thread.
As to when it could be used, I'm not so sure (other than the no-brainer "when you want a variable to have different values in different Threads"). I'd be interested to hear about any instances where someone has used a variable such as this.
how exactly do I use it?Carefully

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    iPad Repair & Screen Replacement Services
    http://www.ifixyouri.com/16-ipad-repairs
    RepairZoom iPad Repair
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    iGadgetResQ
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