ColdFusion Developer's Guide

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Scope Description
Form Contains variables passed from a Form page to its action page as the
result of submitting the form. (If you use the HTML form tag, you must use
method="post".) For more information, see Chapter 28, “Introduction to
Retrieving and Formatting Data.”
function local Contains variables that are declared inside a user-defined function or
ColdFusion component method and exist only while a function executes.
For more information, see Chapter 9, “Writing and Calling User-Defined
Functions.”
Request Used to hold data that must be available for the duration of one HTTP
request. The Request scope is available to all pages, including custom
tags and nested custom tags, that are processed in response to the
request.
This scope is useful for nested (child/parent) tags. This scope can often be
used in place of the Application scope, to avoid the need for locking
variables. Several chapters discuss using the Request scope.
Server Contains variables that are associated with the current ColdFusion server.
This scope lets you define variables that are available to all your
ColdFusion pages, across multiple applications. For more information, see
Chapter 15, “Using Persistent Data and Locking.”
Session Contains variables that are associated with one client and persist only as
long as the client maintains a session. They are stored in the server’s
memory and can be set to time out after a period of inactivity. For more
information, see Chapter 15, “Using Persistent Data and Locking.”
This Exists only in ColdFusion components or cffunction tags that are part of a
containing object such as a ColdFusion Struct. Exists for the duration of
the component instance or containing object. Data in the This scope is
accessible from outside the component or container by using the instance
or object name as a prefix.
ThisTag Used only in custom tag pages. The ThisTag scope is active for the current
invocation of the tag. If a custom tag contains a nested tag, any ThisTag
scope values you set before calling the nested tag are preserved when the
nested tag returns to the calling tag.
The ThisTag scope includes three built-in variables that identify the tag’s
execution mode, contain the tag’s generated contents, and indicate
whether the tag has an end tag.
A nested custom tag can use the cfassociate tag to return values to the
calling tag’s ThisTag scope. For more information, see “Accessing tag
instance data” on page 292.
Thread Variables that are created and changed inside a ColdFusion thread, but
can be read by all code on the page that creates the thread.
74 Using ColdFusion Variables