docs: public Object setupBookmark(int iAreaDesc)
      {
          if (this.getKeyFields() == 1)   // Special case - single unique key;
              return this.getField(iAreaDesc).getData();
          BaseBuffer buffer = new org.jbundle.thin.base.db.buff.str.StrBuffer(null);
          this.setupKeyBuffer(buffer, iAreaDesc);
          return buffer;
      }