(Quick Reference) # 8.3.1 Variables and Scopes Version: 3.2.8 ## 8.3.1 Variables and Scopes Within the scope of a tag library there are a number of pre-defined variables including: `actionName` - The currently executing action name `controllerName` - The currently executing controller name `flash` - The flash object `grailsApplication` - The GrailsApplication instance `out` - The response writer for writing to the output stream `pageScope` - A reference to the pageScope object used for GSP rendering (i.e. the binding) `params` - The params object for retrieving request parameters `pluginContextPath` - The context path to the plugin that contains the tag library `request` - The HttpServletRequest instance `response` - The HttpServletResponse instance `servletContext` - The ServletContext instance `session` - The HttpSession instance | Quick Reference (hide)