Open a connection to your remote server. The equivalent of the menu item File->Connect to server
Close the connection to your remote server. The equivalent of the menu item File->Disconnect from server
Download the list of active groups from the remote server. This can take quite some time. The equivalent of the menu item File->Get Active File
Opens the "find group" dialog. This is described in detail under the entry for the equivalent menu item, File->Find
Toggle the state of the selected group(s). If they were subscribed, they are now unsubscribed, and vice versa. Equivalent of the menu item Newsgroup->(Un)Subscribe
Check the remote server, to see if it has any new unread articles you haven't seen yet.
Post a new article to the currently selected group. The equivalent of the menu item Newsgroup->Post new article