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Reference.org
Task Control Block
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<p>The Task Control Block (TCB) contains the state of a task in, e.g., <a href="/facts/OS%2f360_and_successors/nQbdNbx6">OS/360 and successors</a> on <a href="/facts/IBM_System%2f360_architecture/mKdceH2S">IBM System/360 architecture</a> and successors. </p>