You can define the following ColdFusion server variables:
Client variables associate data with a specific client. Client variables maintain the applications state as the user moves from page to page in the application, as well as from session to session. "Maintaining state" means to preserve information from one page (or session) to the next so that the application "remembers" the user and the users previous choices and preferences.
Cookie variables access cookies passed to the server by the browser.
CGI variables provide information about the server running ColdFusion, the browser requesting a page, and other information about the processing environment.
Server variables can be accessed by all clients and applications on the server. They persist until the server is stopped.
Local variables are created with the CFSET
tag or CFPARAM
tag within a ColdFusion page.