We often collaborate with other medical specialists out of necessity. Some medical collaboration systems have been developed. They typically are constructed in a client/server model way. The server is administrated by a center hospital and the sattelite connects to the server. But in this model, we cannot collaborate with the other center hospital. We are enclosed by its network. So we have been developping the P2P collaboration tool for medical staff and get beyond the barrier. This project named MeGA-Net(Medical Grid Alliance Network) is supported by a grant under the under the Exploratory Software Project FY2003(IPA, Japan). This software has been opened under BSD liscence. You can view the CVS repository here.