In this paper, we introduce the design and implementation of VSPLUS, a high-level multi-user extension library to enable people to simultaneously manipulate interactive VRML worlds over networks. The key consideration of the VSPLUS design is the ease of creations of multi-user worlds from single-user standard VRML worlds without extensive programming efforts. The library is implemented on the Community Place system and evaluated with practical contents. KEYWORDS VRML event model, Multi-user technologies, Living Worlds , The Community Place system, Netnode, Consistency manager