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host status

  I'm trying to find a hopefully portable way to determine if some specified
host is accessable on the net (say for ftp).  Something similar to:
  (host-up "warbucks") ==> t if host is accessable, nil if not.
  There is a (chaos:host-up host) function, but it only works for stuff on
the chaos net. Is there a logical equivalent for all known nets??