...
Mail reflector - there is an associated mailing list for all groups. All members of the relevant group automatically becomes member of the associated mailing list. Please note that some groups can have extra mailing lists, these are usually listed on the frontpage of the group, these you have to manually be connected to. Ask The Chair or ECO contact for assistance, or write the helpdesk.
Forum - some groups use forum for community based communication. In the relevant group a tab in the menu will give you access to the forum.
Chat system - the Chat system are for some groups enabled - access to the chat is given by a tab in the group menu. Please note the chat system have a different login scheme, you will find the login information in your profile page. Please read more how to use the chat system here.