The Help Class
encapsulates the HTML Help 1.0 engine. You can use the Help object to show compiled Help files (.chm) or HTML files in the HTML Help format. Compiled Help files provide table of contents, index, search, and keyword links in pages. Shortcuts work only in compiled Help files. You can generate HTML Help 1.x files with a free tool from Microsft called HTML Help Workshop
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An easy way to show a compiled help file in a second window:
C#
Help.ShowHelp(this, helpProviderMain.HelpNamespace);
VB.NET
Help.ShowHelp(Me, hlpProviderMain.HelpNamespace)