Client Server Model

• Client server architectureImage by Flickr.com, courtesy of Maurizio Zanetti
  
  A client program like a web browser is used to access resources from a server. It does this through server requests, which the server responds to, and the results are displayed to the user.
  
  

The Client Process

• During runtime or execution, the user interface manages local resources, validates entered data and dispatches user requests to server applications.
  
  

The Server Process

• It executes client requests, updates and manages databases. The server process performs back-end tasks.
  
  

The Three-Tier Architecture

• The three-tier architectureImage by Flickr.com, courtesy of Javier Aroche
  
  This introduces an "agent" in the runtime process between the client and server that can perform a number of functions, such as monitoring and translating.
  
  

Benefits to Businesses

• Faster flexibility to changing business environments, better shared resources and vendor independence are among the benefits.
  
  

Example in Windows

• Windows client server runtimeImage by Flickr.com, courtesy of Ian Burt
  
  The Csrss.exe process is a client server runtime process that is essential to Windows and responsible for console windows. It must be running at all times.