1. Embedded
1.1. Windows Embedded CE
1.2. Windows Mobile
1.3. Palm OS
1.4. iPhone OS
1.5. Blackberry
1.6. Google Android
1.7. Embedded Linux
1.8. Symbian OS
2. Stand-alone
2.1. Windows 7
2.1.1. Programs
2.1.1.1. Windows Firewall
2.1.1.1.1. Enhance Security
2.1.1.2. Windows DVD Maker
2.1.1.2.1. Make CD/DVD
2.1.1.3. Windows Media Player
2.1.1.3.1. Watch video
2.1.1.3.2. listen to music
2.1.1.4. Desktop Gadget Gallery
2.1.1.4.1. Widget
2.1.1.4.2. Calender
2.1.1.4.3. Note
2.1.2. Versions
2.1.2.1. Windows 7 professional
2.1.2.2. Windows 7 Ultimate
2.1.2.3. Windows 7 starter
2.1.2.4. Windows 7 Home Premium
2.2. Mac OS X
2.2.1. Mac OS X Lion
2.3. UNIX
2.3.1. Multitasking operating system
2.3.2. Developed in 1970 by Bell Lab
2.3.3. Used by Power user
2.4. Linux
2.4.1. Open Source
2.4.2. Multitasking
2.4.3. GNOME
2.4.4. Software
2.4.4.1. QuickTime
2.4.4.2. Mozzila
2.4.4.3. Netscape
2.4.4.4. Yahoo Messenger
3. Server
3.1. Windows Server 2008
3.1.1. Upgraded version of windows server 2003
3.1.2. Multiple editions
3.1.2.1. Hyper-V
3.1.2.2. Virtualization technology
3.1.2.2.1. practice of sharing or pooling computing resources