A method performed by a computer system. The method including storing a version of a mass-produced printed paper, and forming a reference within the version. The reference is associated with an operation and at least a portion of the version. The version is displayable on a display device as a likeness of the paper, and the portion is selectable to cause performance of the operation.

 
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< Use of public switched telephone network for capturing electronic signatures in on-line transactions

> Encryption of information input to portable card terminal using encryption key information associated to portable card terminal identifier

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