SiteFusion allows object-oriented PHP applications to operate as OS-native applications through a XULRunner-based thin client. The client connects to the SiteFusion daemon through an ordinary Web server,... and applications run in separate continuous processes. Two-way communication is enabled, without the need for additional Web server configurations. The implementation of the XUL framework in a PHP class structure includes an implementation of the Mozilla tree view optimized for very large trees, supporting drag-and-drop, editable cells, and sorting.