System Requirements:

Members need only a Net-connected computer with a current browser. Supported browsers include: Internet Explorer 6.x, 7.x and 8.0, Firefox 1.x, 2.x and 3.x and Mac Safari 2.x. 

If you intend to conduct application/desktop sharing, our system requires that all members, including the Web Meeting host, have Internet Explorer 5.5 or higher, Netscape 7.0 or higher, or Mozilla 1.0 or higher, the current version of Java Virtual Machine (JVM, included with all of modern browsers) installed and browser settings that do not block or disable the JVM. 

Additionally, the Web Meeting Host will require a one-time ActiveX plug-in that can be downloaded in advance or on-the-fly during your session.