Abstract: A value is exchanged between accounts held by users of two portable electronic devices. The devices synchronize disappearance of the image at the sending device and appearance of the image at the receiving device to give the impression that a physical object representative of the value has been exchanged (e.g., handed) between the users.

Abstract: A value is exchanged between accounts held by users of two portable electronic devices. The devices synchronize disappearance of the image at the sending device and appearance of the image at the receiving device to give the impression that a physical object representative of the value has been exchanged (e.g., handed) between the users.

Abstract: A value is exchanged between accounts held by users of two portable electronic devices. The devices synchronize disappearance of the image at the sending device and appearance of the image at the receiving device to give the impression that a physical object representative of the value has been exchanged (e.g., handed) between the users.

Abstract: A method of collecting input data at a server includes: receiving a message from a client device, the message containing a location identifier; responsive to receiving the message, retrieving a plurality of keywords corresponding to the location identifier from a memory; transmitting a message to the client device containing the retrieved keywords; receiving a selection of one of the retrieved keywords from the client device; retrieving from the memory an action identifier corresponding to the selected keyword; and executing the action corresponding to the action identifier.