With Dimdim Free, the presenter's video is shown to all the participants of the meeting. It is not possible to see anybody else's video.

With Dimdim Pro and Dimdim Enterprise, one attendee's video can also be shown to all the participants of the meeting. Users can enable this feature by going to the Features tab in the portal and selecting Camera and Microphone or Camera only (if you don't want to use microphone)from the Audio and Video field.



The presenter can choose which attendee's video is to be shown. The presenter can also change the attendee, whose video is being shown, dynamically during the meeting as shown below.






So in Dimdim Free there is one-way video and with all other versions there is 2-way video.