Abstract: Mainly on the Internet (though extendible to any other communications or advertising medium, present or future), which offers great advantages both to those at whom a product or service is offered, as consumers, and to suppliers of services or contents. It consists of the displaying of normally multimedia presentations of a product or service by means of an advertising message and which will habitually include a brief questionnaire on what is shown in the message, on the consumer him or herself, or any other data which the advertiser considers to be relevant and useful. When looking at the message and replying to its questionnaire (if there is one), the possible consumer will obtain a certain number of credits that will be able to be used as if they were virtual money in various payment services.

Abstract: The invention relates to a pressure sensor implanted into the skull to emit an electrical signal representing the intra-cranial pressure; this sensor is of the type which includes on one hand a test body (1) comprising a deforming diaphragm (3) and of an undeforming guard ring (2), and on the other hand a deformation detector (5) associated with the diaphragm; the test body (1) is made of an integral piece, in particular plastic, and has a continuous front side (1a) which preferably is planar; the mechanical and dimensional properties of the constituent plastic are matched in such a manner that under the maximum pressure of 30 kilopascals, the diaphragm deflection is within a predetermined range; within this range, the dura mater pressed by the sensor transmits faithfully the intracranial pressure with adequate sensitivity to employ a resistive type transducer which simultaneously is simple, rugged compact and economical.