Example 2. 

  Dir(.etc.chandev_conf)
  (["qeth0", "lcs1", "ctc0", "escon0", "hsi7"])

  Read(.etc.chandev_conf.ctc0)
  ("0x0600,0x0601,0,0")

  Write(.etc.chandev_conf.ctc0, "0x0600,0x0601,0,1")
  (true)