[otrs] Survey module how to use it ?

Hi, I'm still wondering how to use this module under OTRS because there is no documentation on it nowhere (or I did not find it after a long search on Google, otrs.org website and forums). I tried to create a survey, add some questions on it, mark it as valid. Tried to create a ticket then close it, checked everywhere if I saw a new link/button like "Send survey" but no way :( Could anyone which is using this module or OTRS people can give us informations on this module that can be useful please ? This module is totally useless at the moment because of this documentation lack :( Thanks by advance, Laurent MINOST