I tried to e mail Mark Friedman but it did not work so I hope the respons will be of interest to all. Mark - at the Marine Museum of the Great Lakes at Kingston we are now seaching for a laserdisk system. I am interested in the equipment your are using at the Mariners and if you are giving viewers a choice of programme material from the same disk - if so what kind of control devices are in use. Thank you. Maurice Smith, Curator.