Abstract: Method and system for initiating and establishing a communication between mobile computing devices, in particular initiating and establishing an online exchange of messages in real time, i.e. instant messaging, with one or more simultaneous users of a computer network.

Abstract: Method for the remote supply, display and/or presentation of dynamic informative contents by generating a QR code with a dynamic content, which provides to define a quantity n of a series of QR codes to be generated, to generate x URL addresses on the Internet, until x=n, to verify the univocity of each of the x URL addresses generated, by comparing them with a list of URL addresses, to generate n QR codes, each encoding the x=n URL addresses generated and verified as univocal, to assign a generated and univocal URL address to a specific accredited service user in a form that can be loaded and modified dynamically, to configure the generated and assigned URL address in order to display the informative contents, to optically acquire the QR code and to decode the encoded URL address, directing the user to the informative contents of the URL address.