The "config" method includes any configuration code that should be run on every request in order for this program to work. This code will be included - as is - in /_config/configfiles.cfm. That code will be run in a method inside the Framework itself (so no locally scoped variables set here will persist to the page).
Variables available to the "config" method:
It is recommended to param configuration settings with the "paramSetting" method rather than set them with the "setSetting" method so that any settings in the site will supercede the defaults set in a program.
<cffunction name="config" access="public" returntype="void" output="no">
<cfset Config.paramSetting("SessionScope","Session")>
</cffunction>