Abstract: A portable hand held computing and indicating device for use in a verification system of the type wherein a first non-predictable code is generated at a first mechanism in accordance with a predetermined algorithm in response to both a unique static variable and a dynamic variable and a second non-predictable code is generated at a second mechanism in accordance with the predetermined algorithm in response to both the unique static variable and a second dynamic variable which corresponds to the first variable. The non-predictable codes are compared at the second mechanism to effect verification. The device forms the first mechanism and includes a processor having the algorithm preprogrammed therein and a means for storing a static variable which is unique for each device. The device also includes a means for generating a time varying dynamic variable which is substantially the same as that generated at the second mechanism at a given instant of time.

Abstract: A wall protector includes a retainer member adapted to be connected to a wall surface to be protected, a pair of spaced locking portions generally project outwardly from a wall portion of the retainer member. A resilient member configurated to substantially cover the retaining member when mounted thereon is provided which has a pair of spaced engaging portions projecting towards the retainer member and adapted to snappingly engage the locking portions and maintain the retainer and resilient members spaced from each other at a predetermined distance. Application of inward pressures on the resilient member towards the retainer member causes the resilient member to at least partially deform and cause the locking and engaging portions to separate from each other along the direction of the wall portions while still maintaining locking engagement therebetween and the wall protector members.