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  ["Why should I register?", "source/chm/registration/whyshouldi.htm", "11"],
  ["How can I register?", "source/chm/registration/howtoregister.htm", "11"],
  ["Licensing details", "source/chm/registration/licensingdetails.htm", "11"]
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  ["System environment variables", "source/chm/using/envvar.htm", "11"],
  ["Global variables", "source/chm/using/globalvar.htm", "11"],
  ["Variables support", "source/chm/using/varsupport.htm", "11"],
  ["Run as Windows service", "source/chm/using/service.htm", "11"],
  ["Filter groups", "source/chm/using/filters.htm", "11"],
  ["Find check", "source/chm/using/findcheck.htm", "11"],
  ["Export group/check data", "source/chm/using/exportindex.htm", "1",
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   ["Add new alerts", "source/chm/using/wizzardaddnewalert.htm", "11"],
   ["Change properties", "source/chm/using/wizardchangeproperties.htm", "11"],
   ["Change scheduler", "source/chm/using/wizzardschedule.htm", "11"],
   ["Remove alerts", "source/chm/using/wizzarddelalert.htm", "11"],
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  ["Check panel", "source/chm/ui/hostlist.htm", "11"],
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  ["Dialogs", "source/chm/ui/dialogindex.htm", "1",
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   ["Filter properties", "source/chm/ui/filterprop.htm", "11"],
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   ["Schedule", "source/chm/checks/checkschedule.htm", "11"],
   ["Dependencies", "source/chm/checks/checkdependency.htm", "11"]
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   ["FTP", "source/chm/checks/ftpcheck.htm", "11"],
   ["HTTP", "source/chm/checks/httpcheck.htm", "11"],
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   ["External command", "source/chm/checks/extprogramcheck.htm", "11"],
   ["Database", "source/chm/checks/databasecheck.htm", "11"],
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   ["Process", "source/chm/checks/processcheck.htm", "11"],
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   ["Windows service", "source/chm/checks/ntservicecheck.htm", "11"],
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 ["Alerts", "source/chm/alerts/index.htm", "1",
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   ["Alert repository", "source/chm/alerts/alertrepos.htm", "11"],
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function arr_flatten (x) {
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}