[Koha] How "Instant Fine Calculation at Checkin" works?

Dear Friends, I heard that a new feature added with Koha 3.8.1 version, http://koha-community.org/koha-3-8-1-released/ "Instant Fine Calculation at Checkin" I would like to know how it works? Documentation available? -- Vimal Kumar V. Mahatma Gandhi University Library Kottayam, Kerala- 686 560 Web: http://www.vimalkumar.org Blog: http://linuxhalwa.blogspot.com http://kohageek.blogspot.in --------------------------------------------------------------------------- "I forget what I was taught. I only remember what I have learnt" -Patrick White