Cortona VRML client is the universal tool to view VRML scenes in the Internet. Cortona is designed on the basis of the universal component technology that provides the opportunity of creating a wide range of 3D applications: from graphical processors to complex multi-user Internet-services. Cortona VRML client supports: OpenGL; Direct3D; Java language; Splines and NURBS; External Authoring Interface (EAI); Besides, the client has its own built-in VRML Automation Interface (Automation Interface for managing VRML scenes) based on the ActiveX Automation technology. Cortona provides additional opportunities for detection and resolution of the objects collisions in 3D scenes.