I dont really like the \"summoning friend\" idea because of the reason ninkwi njadro said. What if you are doing a very important thing (doing a quest, training, buying stuff, etc) and get summoned to the middle of nowhere by a friend who is in trouble?
Perhaps you could choose whether to help your friend or not. For example:
Ninkwi is in the 6th level of Yliakum and I am in the 1st. I gave him the summoning friend item. Suddenly he is attacked and uses the item. Then it would send me a message saying: \"Ninkwi Njadro has summoned you from the 6th level. Do you wish to help him? Y/N\"
Therefore, if I choose Yes, I am inmediatelly teleported to ninkwi\'s location. If I choose No, then I stay where I am and a message would be displayed on ninkwi\'s screen saying: \"Golbez does not wish to be summoned\". That way, you won\'t be summoned against your will.