An advisory lock used to allow cooperating TN3270E-MIB applications to coordinate their use of the tn3270eSrvrConfTable, the tn3270eSrvrPortTable, the tn3270eClientGroupTable, the tn3270eResPoolTable, and the tn3270eClientResMapTable. When creating a new entry or altering an existing entry in the any of the tables mentioned above, an application should make use of tn3270eRtSpinLock to serialize application changes or additions. Since this is an advisory lock, the use of this lock is not enforced.