Abstract: This invention relates to a method, apparatus and computer program product for instant messaging, the method comprising: receiving more than one user message from one or more instant messaging applications; defining a user message structure based on the creation time of each message; displaying the messages in the defined structure including order and hierarchical level; determining a user selection of a first message and second message wherein the second message does not follow directly after the first message in the message structure; changing the message structure so that the second message follows directly after the first message and is moved to a selected hierarchical level relative to the first message; and redisplaying the messages in the changed message structure.

Abstract: In the refining zone of a glass melting tank the molten glass is supported on a heat conducting base, such as molten tin, heat is removed from the glass through the base and the depth of glass, length of refining zone and temperature difference between the inlet and outlet of the zone are controlled so that the ratio of return flow to forward flow through the zone is between 1/6th and 1/2.