@Override
  public SystemMemberRegion getRegion(String path) throws org.apache.geode.admin.AdminException {
    Region r = vm.getRegion(info, path);
    if (r == null) {
      return null;
    } else {
      return createSystemMemberRegion(r);
    }
  }
Value that uniquely identifies an instance of a cache for a given member.
geode-core/src/main/java/org/apache/geode/admin/internal/SystemMemberCacheImpl.java