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7. Maintaining State > 7.2. Using Shared Scope Variables

Using Shared Scope Variables

As I mentioned in the introduction, the Web is a stateless environment. ColdFusion addresses this problem by providing five variable scopes you can use to maintain state within your application: application, client, cookie, session, and server. These are known as shared variable scopes because the variables you set within them can exist from template to template, in spite of the stateless nature of the Web. This allows you to build applications that can share data across multiple templates without having to pass the values via form fields or URL variables.

Here’s an overview of the types of shared scope variables you can use in your ColdFusion applications:

Application

Application variables define application-wide settings for your application, such as data-source names and other constants. Application variables are stored in the server’s RAM and are most often defined in the


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