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1. The ability of a mainframe system to remain operational without interruption for long periods
2. A method of processing data in large batches without user interaction
3. The simultaneous execution of multiple tasks to increase performance and efficiency
4. The process of creating a virtual version of computing resources to improve efficiency and flexibility
5. Large, powerful, and expensive computers used primarily by large organizations for critical applications
6. A centralized facility used to house mainframe computers and other networking equipment
7. A method of connecting multiple mainframes to work together as a single system
8. Older mainframe systems that are still in use due to their critical functions and high reliability