User Guide

28 CFML Quick Reference
ColdFusion variables
ColdFusion MX returns variables, such as those returned in a
cfdirectory or cfftp operation. A variable is usually
referenced by scoping it according to its type: naming it
according to the code context in which it is available; for
example, Session.varname, or Application.varname.
You use the cflock tag to limit the scope of CFML
constructs that modify shared data structures, files, and
CFXs, to ensure that modifications occur sequentially. For
more information, see Developing ColdFusion MX
Applications.
Variable scope
ColdFusion MX supports the Variables scope. Unscoped
variables created with the cfset tag acquire the Variables
scope by default. For example, the variable created by the
statement <CFSET linguist = Chomsky> can be
referenced as #Variables.linguist#
Caller scope
ColdFusion MX supports the Caller scope as a structure.
Client variables
The following client variables are read-only:
Client.CFID
Client.CFToken
Client.HitCount
Client.LastVisit
Client.TimeCreated
Client.URLToken
Server variables
Use the Server prefix to reference server variables, as
follows:
Server.ColdFusion.ProductName
Server.ColdFusion.ProductVersion
Server.ColdFusion.ProductLevel
Server.ColdFusion.SerialNumber
Server.ColdFusion.SupportedLocales
Server.OS.Name
Server.OS.AdditionalInformation
Server.OS.Version
Server.OS.BuildNumber
Application and session variables
To enable application and session variables, use the
cfapplication tag. Reference them as follows:
Application.myvariable
Session.myvariable
To ensure that modifications to shared data occur in the
intended sequence, use the cflock tag.
The predefined application and session variables are as
follows:
Application.ApplicationName
Session.CFID
Session.CFToken
Session.URLToken