The Virtual Reality Modeling Language is the international standard for interactive 3D on the Web. It has been superseded by X3D, the largely back-compatible successor to VRML. VRML Browser plugins allow you to view VRML content through your web browser.
One of the dreams which has driven the development of 3D on the Internet is that of shared, multi-user environments with communications between users. This dream is now being met in reality by a variety of technologies, some proprietary and some portable.