This preference dialog lets you control the granularity of applet groups.
Applet groups are important because they specify which applets can cooperate and share information.
By default, all applets loaded from the same server belong to the same group. In certain cases, you'll want to group applets from different servers together. This dialog lets you do that. Each word in the text widget is an applet group name. If the group name does not begin with a period, it is a host name, and the group consists of exactly that host.