1. Cost
2. Maintenance
3. Performance
4. Station inter-changeability
5. Backups
6. Batery backup (UPS)
7. Flexibility
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6. Batery backup (UPS)

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The only important machine is the application server. Putting a single batery backup on it will protect the work in progress of every user in the advent of a power failure. With conventional workstation, this requires one unit per computer.
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