Operating System
作者：Omar Sanchez
1. What % use Windows?
1.1. 90%
1.1.1. Focus on window 7
2. Aplle, OXS, Leopard
3. Linux: Open Source, Fee
4. definiton:
4.1. The collection of software that directs a computer's operations, controlling and scheduling the execution of other programs, and managing storage, input/output, and communication resources.
5. Cell Phone Operating Systems
