Show Help
You can use Help.ShowHelp(). also you can use helpProvider get parameter such as helpProvider.getHelpKeyword and then call browser to pass a URL to it.
private void ExecUrl(string url)
{
ProcessStartInfo startInfo = new ProcessStartInfo("IExplore.exe");
startInfo.WindowStyle = ProcessWindowStyle.Maximized
startInfo.Arguments = url;
Process.Start(startInfo);
}