code: function lookupAddresses(state, actorIds, cb) {
  	if (!mage.session) {
  		return cb(new StateError('Cannot find actors without the "session" module set up.', {
  			actorIds: actorIds
  		}));
  	}
  
  	mage.session.getActorAddresses(state, actorIds, cb);
  }
docs: Utility method to lookup and cache addresses
  to send messages to given actorIds
  
  @param {*} state
  @param {*} actorIds
  @param {*} cb