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Synchronization object that provides a unique distributed atomic operations
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Can be used to implement various application-level synchronization mechanisms
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Provide means to implement exclusive access
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Token objects are created within given Session
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Token can be used to:
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add or remove a TokenListener
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grab a Token (exclusively or non-exclusively)
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list all the Clients that are holding (grabbing or inhibiting) this Token
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release a Token
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test a Token's current status
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give a Token to another Client
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request a Token from another Client
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