It contains easy notes of operating system.It explains the core concepts of operating system with diagrams and easy manner.Any person having less knowledge of operating system will be capable of learning the operating system by simply using the application.
It contains attractive diagrams that explains the concept in easy manner.
It explains following topics;

> Thread
> Memory Management
> Cpu Scheduling
> Filing
> Overview of Operating System
> Security
> Process Management
> Context Switching
> Process Control Block
> Interprocess Communication
> Remote Method Invocation
> OS interfaces
> OS Structure
> System Calls
> Memory allocation
> Paging
> Fragmentation
> Premptive /Non Premptive Scheduling
> Priority Scheduling
> Shortest Job First
> Roundrobin
> File Allocation Criteria
> File Access Mechanism
> Multi Threading Models