Abstract: A computing device combines presence, profile, and preferences information of the originators and recipients of communications in such a way as to enable a communication session or sessions between the session originator and one or more recipients to be automatically set up over one or more channels of communication. The channel or channels that are selected are those that best fit the constraints expressed in the presence, profile, and preferences of the originators and recipients of communications.

Abstract: A method for partially freezing an aqueous mixture comprising simultaneously or in either order the steps of: placing said aqueous mixture in contact with at least part of a freezing surface; cooling the freezing surface to below the freezing point of the aqueous mixture; so that ice forms at the freezing surface; and oscillating the freezing surface relative to the aqueous mixture in a direction that is not perpendicular to at least part of the freezing surface; characterised in that the oscillation is linear with a frequency of between 20 and 200 Hz.