Understanding Helpers and User Defined Functions

I know there is the /includes/helpers/ApplicationHelper.cfm

I think I saw where you could put helpers in view file like


/views/test/myveiwHelper.cfm put the UDF’s in here just for this view only.

Is this true?

If not then what is the best Practice for this?

Is there a way to include a helper that is not global in side of one or two handlers?

or in the Model?