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We are developing WFE, a system for Real-Time Collaborative Editing (RTCE) for existing Web pages. We aim to enable several users to perform simultaneous modifications on existing Web pages in their browsers, while modified contents are reflected to other users in real-time. In this paper, we present the application of WFE to a cloud computing environment as well as its advantages. The environment chosen is Google App Engine, which is a platform for developing Web applications. Our comparison experiments show that we can achieve this by using push technology to perform synchronization.