The main advantage of FCTM is that users can customize the states and state dependencies of cooperative transactions to reflect the different requirements of CSCW applications.
FCTM的优点在于用户能够根据不同的CSCW应用领域的需求，灵活地定义协同事务的状态和状态依赖。
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Whiteboard is one of important interactive tools based on graphics in Computer Supported Cooperative Work (CSCW). It supports multiple users at different places interact by PCs.
A concurrent control algorithm based on time stamps and operation transposition is given to improve the response rate of users with lower speed in cooperative design system with centralized structure.