The Koi infrastructure is built around a client/server architecture using a Web Services RPC communications model. The clients are individual eclipse platform instances that communicate with a "collaboration server" that supports data persistence and implements shared collaborative services. For the collaboration server component, Koi uses the core eclipse platform augmented with a JDBC accessed relational database and with a facility for hosting "service plug-ins" that are remotely accessible using Web Service protocols. Collaborative features are implemented using client-side plug-ins that make requests to service plug-ins running on a collaboration server. The Koi infrastructure includes both client-side and server-side support for these interactions. The base infrastructure also includes some base services such as user identification/authentication, client-to-client messaging, and event notification.