protected internal void ProcessMessageReplyIsOn(IrcMessage message)
{
Debug.Assert(message.Parameters[0] == localUser.NickName);
// Set each user listed in reply as online.
Debug.Assert(message.Parameters[1] != null);
var onlineUsers = message.Parameters[1].Split(' ').Select(n => GetUserFromNickName(n));
onlineUsers.ForEach(u => u.IsOnline = true);
}