What is the purpose of a CallbackHandler in a CXF-based client or endpoint?

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Issue

What is the purpose of a CallbackHandler in a CXF-based client or endpoint?
Is a CallbackHandler used to provide a password or to take a username/password combo and validate it?

Environment

JBoss Enterprise Application Platform (EAP) 6.x
Apache CXF
Apache WS-Security (WSS4J)

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