Abstract: A computerized method of associating an economic transaction with messages being sent across a communication network. The method comprises providing a message to be sent from a sender to at least one intended recipient, constructing at least one transaction securely associating an economic value to be transferred from the sender to at least one intended recipient, associating between the transaction and the message, and transmitting the message from the sender to at least one intended recipient.

Abstract: A method of identifying the position of an opening, for example a door or a cargo bay, or the like of an aircraft, said opening having a predetermined perimeter, said method comprising: i) providing at least one passive target means (10, 11) proximate the perimeter of said opening and preferably being disposed proximate the perimeter of said opening, and when said opening is a door proximate the four corners of said door, and in another embodiment said target means is provided as a cluster of targets for example, at least one target located proximate each corner of said door; ii) directing a preferably pulsing lighting means (30) on said target (10, 11), preferably a passive reflective target such as that manufactured by the 3M company under the trademark Scotchlite® in one embodiment being in the invisible spectrum such as infrared or the like; iii) providing a target identification means and preferably at least one camera (20) and preferably a digital camera synchronized with said lighting means (30) and pr