public void forEachVMInvoke(String methodName, Object[] args) {
    forEachVMInvoke(getClass(), methodName, args);
  }
Assumes there is only one host, and invokes the given method in every VM that host knows about.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/DistributedCacheTestCase.java