Much of a program for a web app runs on a distant computer, often called the

server

Explanation:

Much of a program for a web app runs on a distant computer, often called the server. Most of the backend code execution happens on the server and the results of the processing are passed to the client browser for display to the user. Common programming environments for backend web applications include PHP,Servlet,ASP.NET etc. Client side scripting is mostly done using Javascript.

a software system that is used for viewing and creating hypertext is a hypertext system.

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