17.4 Software as a service
In the previous sections, I discussed client–server models and how functionality may be distributed between the client and the server. To implement a client–server system, you may have to install a program or an app on the client computer, which communicates with the server, implements client-side functionality, and manages the user interface. For example, a mail client, such as Outlook or Mac Mail, provides mail management features on your own computer. This avoids the problem of server overload in thin-client systems, where all of the processing is carried out at the server.
The problems of server overload can be significantly reduced by using web technologies such as AJAX (Holdener, 2008) and HTML5 (Sarris 2013 ...
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