Boris,

Is there a way to generate a HTML in a different window/tab as simple as the GenerateReport procedure does with pdf?
There is no built-in feature to generate a HTML file as the GenerateReport does and display the results in a new browser tab-page or window but it ain't difficult to make this either.

Is there an example of a HTML report calling a different HTML report with a hyperlink
No there is none and you would need self written Javascript code to decide what to do with the HTML hyperlink ID. With the still under development Enterprise Edition you could have full HTML instructions e.g. URLs in the document.