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The essence of this work is employment of IT and mathematical methods in development of remote applications with dynamically changing media. Analysis and practical use of methods are based on instances of internet games. The main groups and peculiarities of rapidly growing entertainment form – internet games – and programming technologies and languages used in development of such games are presented. Multiplayer multisession internet games with persistent world are analyzed. The main purpose of work is to highlight such games' dynamic aspects and implementing solutions. Differences and similarities of dynamics in real time games and turn-based games are highlighted with aim to integrate strength of both groups. Goals of work are analysis of methods and implementation of factors which influence game dynamics: user activity synchronization, persistent and changing game environment, data streaming. Implementation solutions are submitted in form of multiplayer real time internet game "Žvejyba".