Help in using link type field from form application

Hello,
can you please explain me, using a simple example, how to use the Link Type Field from a form application ?
See screenshot attached. It’s the second option from the top.

I know how to use a generic link from a label field to another page: I set the label field value to an href inside the OnLoad event, but I guess this is a totally different link.

Some clarification would be welcome.

Thanks

Screenshot from 2016-03-03 10:39:48.png

Check out the video
http://www.scriptcase.net/scriptcase-videos/#links

It does not answer my question at all.
I am talking about a field link from a FORM application, not a GRID application.
Field link from a FORM application are somewhat related to label field in a way it is not clear to me yet.