Operating System

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