The court administrator of each court having jurisdiction of child custody matters shall maintain a registry to enter the following:

1. (a) certified copies of custody decrees of other states received for filing;
2. (b) communications as to the pendency of custody proceedings in other states;
3. (c) communications concerning a finding of inconvenient forum by a court of another state; and
4. (d) other communications or documents concerning custody proceedings in another state which may affect the jurisdiction of a court of this state or the disposition to be made by it in a custody proceeding.