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[DllImport("hhctrl.ocx", SetLastError=true, EntryPoint = "HtmlHelpW", CharSet = CharSet.Unicode)]

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static extern IntPtr HtmlHelp(

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        HTMLHelpCommand command,

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    public enum HTMLHelpCommand : uint

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<DllImport("hhctrl.ocx", SetLastError:=True, EntryPoint:="HtmlHelpW", CharSet:=CharSet.Unicode)> _

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Function HTMLHelp( _

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Public Enum HTMLHelpCommand

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HTMLHelp(Nothing, filePath, HTMLHelpCommand.HH_HELP_CONTEXT, contextID)

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HTMLHelp(Nothing, filePath, HTMLHelpCommand.HH_DISPLAY_TOC, 0)

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HtmlHelp(IntPtr.Zero, filePath, HTMLHelpCommand.HH_HELP_CONTEXT, contextID)

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HtmlHelp(IntPtr.Zero, filePath, HTMLHelpCommand.HH_DISPLAY_TOC, 0)

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[DllImport("hhctrl.ocx", SetLastError = true, EntryPoint = "HtmlHelpW", CharSet = CharSet.Unicode)]

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static extern int HtmlHelp(

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        HTMLHelpCommand uCommand,

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    HtmlHelp(IntPtr.Zero, null, HTMLHelpCommand.HH_DISPLAY_TEXT_POPUP, param);