A system and method for wireless validation of gaming vouchers output from electronic gaming machines includes a number of electronic gaming machines physically connected to a centralized computer which receives and stores game transaction information, including records of printed vouchers and pay-out amounts relating thereto. Typical access points for Internet, intranet and wireless traffic are described. The simultaneous detection of multiple frequencies allows the receiver to search the frequency range of the transmitted signal in larger increments of frequency, thereby increasing the speed of acquisition. Whatever is used it is capable of providing enough energy to drive over a thousand nails. A suspended state is provided in which the handles are assigned to a particular resource but cannot be dereferenced to obtain a pointer to that resource. Given the non-linear invariance transformation, optimization can be formulated as a semidefinite program, which is given by a linear objective function that is minimized subject to a linear matrix inequality.