A ColdFusion custom tag returns the following variables:

ThisTag.ExecutionMode
ThisTag.HasEndTag
ThisTag.GeneratedContent
ThisTag.AssocAttribs[index]

A custom tag can set a Caller variable to provide information to the caller. Set the Caller variable as follows:

<cfset Caller.variable_name = "value">

The calling page can access the variable with the cfoutput tag, as follows:

<cfoutput>#variable_name#</cfoutput>

Request variable

Request variables store data about the processing of one page request. Request variables store data in a structure that can be passed to nested tags, such as custom tags, and processed once.

To provide information to nested tags, set a Request variable, as follows:

<CFSET Request.field_name1 = "value">
<CFSET Request.field_name2 = "value">
<CFSET Request.field_name3 = "value">
...

Each nested tag can access the variable with the cfoutput tag, as follows:

<CFOUTPUT>#Request.field_name1#</CFOUTPUT>

Form variable

ColdFusion supports the Form variable FieldNames. FieldNames returns the names of the fields on a form. You use it on the action page associated with a form, as follows:

Form.FieldNames