This new feature of NetSolve is still under investigation. We are aware that security is an important issue here. For now, NetSolve is still a research project developed to allow experimentations with this relatively new type of software. In the future, more attention will be given to the user-supplied mechanism in order to make it as safe as possible. As mentioned earlier, we may use Java in order to set up a viable security manager. Using Java currently appears to be the best solution for security, but it has obvious drawbacks. First, the user would have to write his function in Java: the typical NetSolve user is a scientist who does not have the time or inclination to learn new languages, especially object-oriented ones. Second, with the current implementations of Java, efficiency would also be a problem.