About, "Good evening, I am interested in learning to use and purchasing a cootie key (sideswiper). Are there any commercially available or anywhere I can learn to make one? Have a great night and thanks." 73 Steve N4TKP Steve, see QRZ.com for N4NT who has myriad info on them. He has made up dissertations about them too, which he will e-mail you. Have fun, Roy K6XK