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- OS X basis
- Dropped trademark for 12 across and got cross instead with operating system
- Computer workstation operating system
- Bell Labs system
- Computer operating system with a penguin mascot
- Operating system developed by AT&T originally
- When core goes, disconnect operating system
- Viewable by anyone with zip software
- Computer system developed at Bell Labs
- University gets wrong mark from computer's multi-user operating system
- Operating system choice
- Operating system used since the 1970s
- Source of the Mac's operating system
- Pioneering computer operating system
- System developed by Bell Labs