Hello all, In ns-mcast.tcl where Node::join-group {agent group}, after the protocol specific join-group function has been returned, there is a line <lappend Agents_($group) $agent>, I wondering what does this Agents($group) point to, the local agents at this node that join $group previously, or agents joined the group but present at other nodes? could someone explain to me? tks, shuqian