Who will prepare FRS (functional requirement documents)? What is the important of FRS?

The Business Analyst will pre pare the FRS.Based on this we are going to prepare test cases.It contains
1. over view of the project
2. Page elements of the Application (Filed Names)
3. Prototype of the of the application
4. Business rules and Error States
5. Data Flow diagrams
6. Use cases contains Actor and Actions and System Responses

What is difference between the Web application testing and Client Server testing?

Testing the application in intranet (without browser) is an example for client -server. (The company firewalls for the server are not open to outside world. Outside people cannot access the application.)So there will be limited number of people using that application.Testing an application in internet (using browser) is called web testing. The application which is accessible by numerous numbers around the world (World Wide Web.)So testing web application, apart from the above said two testing there are many other testing to be done depending on the type of web application we are testing.If it is a secured application (like banking site- we go for security testing etc.)If it is an e-commerce testing application we go for Usability etc… Testing.