An advisory lock used to allow cooperating TN3270E-RT-MIB applications to coordinate their use of the tn3270eRtCollCtlTable. When creating a new entry or altering an existing entry in the tn3270eRtCollCtlTable, 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.