CoCalc provides the best real-time collaborative environment for Jupyter Notebooks, LaTeX documents, and SageMath, scalable from individual users to large groups and classes!

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 - vmid: backtrack
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   driver: workstation
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   location: /opt/vm/backtrack5/Backtrack5x64.vmx
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   modifiers:
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     - Test
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   credentials:
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     - user: root
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       pass: toor
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   os: linux
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   flavor: ubuntu
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   arch: 64
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