This online resource from the IETF Web site provides information and links regarding the informational RFC 8589 that was published by the IETF (Internet Engineering Task Force) in May, 2019.
This document describes the ‘leaptofrogans’ Uniform Resource Identifier (URI) scheme, which enables applications to launch Frogans Player on a given Frogans site. For instance, once implemented, it will enable a Web browser to automatically launch Frogans Player and open a specific Frogans site when an end-user clicks on a Frogans address in a Web page; or it will enable an e-mail client, such as Thunderbird or Outlook, to automatically launch Frogans Player and open a specific Frogans site when an end-user clicks on a Frogans address contained in an e-mail.