Abstract: In some examples, a method for generating an interactive three-dimensional quantitative thermal heat flow mapping of an environment comprises generating a three-dimensional representation of the environment, the representation comprising multiple surfaces defining respective boundaries of the environment, generating a thermal image representing a surface temperature at multiple points on respective ones of the surfaces of the environment within the three-dimensional representation, determining a measure for an ambient temperature within the environment, determining respective measures for incident radiant temperature of the surfaces, determining respective measures for the emissivity of the surfaces, providing a measure of temperature outside of a surface, calculating, at each of the multiple points, a value for the instantaneous heat flow per unit area using the measures for surface temperature, ambient temperature within the environment and incident radiant temperature of the surfaces, and using the values

Abstract: A website is monitored to determine for each of the current web clients currently visiting the site, whether the client is currently located at one of a set of monitored entities of the site. This set of monitored entities may simply be every page of the site. The determination;of whether a client is currently located at a monitored entity is done, for example, by maintaining a database listing all current clients and holding, for each client, a list of the last preceding files requested by the client and the time of the last file request. The database is then periodically interrogated to ascertain for each client whether it is currently at a monitored entity, this information then being used to generate an output indicative of the current distribution of clients across the monitored entities.