This paper describes basic elements of the Web-based platform for multimedia programming which is designed in the framework of the WWW-oriented workplace of applied programmer (W4AP). The proposed platform hides the insignificant features of software and hardware from the applied programmers and provides a unified style for different programming development tools; a comfortable environment combining visual and multimedia programming technologies. The architecture of the W4AP server is shown supporting a programming process and manipulations with multimedia data. Examples are demonstrated of the practical use of the proposed platform as well as user interface features.