tikihelp is a smarty function that will insert a correctly formated and linked help icon for the current page. Use this function to easily place a contextual help icon anywhere in your template. It takes no arguments and uses the current kernel/help icon defined by the IconThemes. Usage would look like:

{tikihelp}

Yep, that's it. All the information that drives the url and such are provided by the PHP code that displays the template by calling setHelpInfo.