| 摘要 |
The present invention provides a security system comprising (a) at least a first handheld device, a first secure entity and a second secure entity, wherein the first handheld device and the first secure entity are programmable to enter into a first unique communication mode in which only the pair of the first handheld device and the first secure can respond to each other's instructions and wherein the first handheld device and the second secure entity are programmable to enter into a second unique communication mode in which only the pair of the first handheld device and the second secure entity can respond to each other's instructions, or (b) at least a first handheld device, a second handheld device and a first secure entity, wherein the first handheld device and the first secure entity are programmable to enter into a first unique communication mode in which only the pair of the first handheld device and the first secure can respond to each other's instructions and wherein the second handheld device and the first secure entity are programmable to enter into a second unique communication mode in which only the pair of the second handheld device and the first secure entity can respond to each other's instructions.
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