CAD tip # 10426:

The default setting is the file %PUBLICDOCUMENTS%\Autodesk\Inventor 2015\Web\en-US\CustomHelpSample.htm - you can change it e.g. to the address of this portal - www.cadforum.cz.

If you want to display a given web page, without changing the setting permanently, you can use the following code of an iLogic rule:

'Default application settings
'default web page/file:
'%PUBLICDOCUMENTS%\Autodesk\Inventor 2015\Web\cs-CZ\CustomHelpSample.htm
' =
'C:\Users\Public\Documents\Autodesk\Inventor 2015\Web\cs-CZ\CustomHelpSample.htm

'web page to display, e.g. "www.google.com"
Dim targetUrl As String = "www.cadforum.cz" 

'Store current settings
Dim defaultUrl As String = ThisApplication.FileOptions.TeamWebFullFilename
Try
    'Temporary chnge settings
    ThisApplication.FileOptions.TeamWebFullFilename = targetUrl

    'Open webpage
    ThisApplication.CommandManager.ControlDefinitions("AppTeamWebCmd").Execute()
Finally
    'Restore settings to original value
    ThisApplication.FileOptions.TeamWebFullFilename = defaultUrl
End Try