code: func (c *syncClient) Ping() (err Error) {
  	if c == nil {
  		log.Println("FAULT in synchclient.Ping(): why is c nil?")
  		return newSystemError("c *syncClient is NIL!")
  	} else if c.conn == nil {
  		log.Println("FAULT in synchclient.Ping(): why is c.conn nil?")
  		return newSystemError("c.conn *SynchConnection is NIL!")
  	}
  	_, err = c.conn.ServiceRequest(&PING, [][]byte{})
  	return
  }
docs: // Redis PING command.