Kemark is pretty good about answering any questions you may have. They can be reached at 845-620-9300. If I were you I would first find out who my bank's designated contact person with Kemark is and go from there.
Also, the ABA recently did a pretty good MSG telephone briefing on 9/27 outlining the risks and responsibilities for your bank. They also presented some of the new changes that will be forthcoming. I would find out who the authorized employees are that are permitted to do signature guarantees and have them listen to this presentation, too.
BTW, some banks choose to have only officers of the bank guarantee, but Kemark says it can be any W-9 employee. Our bank has a list of only those individuals who have attended the training and pay close attention to detail.
Hope this helps.