enum System.Runtime.InteropServices.ComTypes.ADVF flags:

   def enum
      ADVF_NODATA = 1
      ADVF_PRIMEFIRST = 2
      ADVF_ONLYONCE = 4
      ADVFCACHE_NOHANDLER = 8
      ADVFCACHE_FORCEBUILTIN = 16
      ADVFCACHE_ONSAVE = 32
      ADVF_DATAONSTOP = 64.

end enum.
