multiplexing

//Send the command
list command=["Command",llGetPos(),TRUE];
llMessageLinked(LINK_THIS, 0, llDumpList2String(command, "|"), "" );

//Retrieve the command
link_message(integer sender_num, integer num, string str, key id)
{
     list args = llParseStringKeepNulls(str, ["|"], [] );
     string cmd = llList2String(args, 0 );

     if( cmd == "Command")
     {
          vector sentPos = (vector)llList2String(args, 1);
     }
}