A transaction system for use with passive data storage media, such as optical memory cards, uses secure protocols involving digital certificates for communication between a readwrite drive and the medium and also for communication between the drive and a host computer. A large diameter wheel is secured to each end of each side wall, to define a widely spaced rectangular wheel array providing a stable skate platform. The methods include the use of the instruments and implants for either open or minimally invasive fracture fixation surgery.