The interesting thing is that the same forum could be hosted in different widgets on different sites if I read the post correctly.

Freewebs continues to add to their widget catalog with their new forums widget. This customizable plug-in is available for use on your Freewebs page or on another website. Wherever the “widgetized” forum resides, the conversation is updated in real time. This continuous flow of conversation truly represents the capabilities of today’s widgets, and could be an ideal feature for groups of friends or small organizations.

Source: Freewebs Launches Forums Widget