Operating System

1. definiton:

1.1. 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.

2. What % use Windows?

2.1. 90%

2.1.1. Focus on window 7

3. Aplle, OXS, Leopard

4. Linux: Open Source, Fee

5. Cell Phone Operating Systems