The Web Components Server is an ASP.NET Web service running on Internet Information Services (IIS). This virtual directory is used to perform distribution list (DL) expansions and join users to a Web conference when they click on the URL given in the meeting request. This server role is automatically installed on the Standard Edition Server and front-end servers of an Enterprise pool in a consolidated configuration. In an Enterprise pool, expanded configuration, the Web Components Server is installed on a separate physical server. This server role is well suited to be collocated with the Communicator Web Access server role in the Enterprise pool, expanded configuration, because both server roles are Web services and require IIS. See Table 2-8 for the hardware and software requirements for this role.