Charles McElwee

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ColdFusion offers developers several different scopes for variables, each with specific characteristics and uses. Application variables are global, shared by all users of an application. Server variables are similar, but if your server hosts several applications, these variables are shared among all the users of all the applications. Request-scope variables are very handy - especially in the application.cfm template - to set variables that are available to all ColdFusion templates invoked with one HTTP request, including within custom tags that are otherwise shielded from the other variable scopes. Locally scoped variables are general purpose and the most widely used. However, client and session variables are especially interesting. They're most often used to provide users with their own extended attributes for an application. "Personalization" of a Web site greatl... (more)