public static Serializable getSystemId() {
    Serializable ret = null;
    if (getSystemStatic() != null) {
      ret = getSystemStatic().getDistributionManager().getId();
    }
    return ret;
  }
Returns the GemFire system ID of the VM on which this method is run
geode-core/src/distributedTest/java/org/apache/geode/cache30/TXDistributedDUnitTest.java