RESPONDERS
Indicates the number of recipients who have responded to a specified message, optionally for a selected choice.
Return Value
Integer
Syntax
RESPONDERS( action [,
                  choice] )
         
where:
- action is the action sequence number for the action.
- choice is the optional particular choice for which you want to see how many selected it.
If omitted, the return value is a total of all who responded, regardless of their choices.
The value for this argument must be a valid return value for the choices as defined on the Event Action Prompt and Event Action Prompt Choices forms.