TopNavigation Frameless: Previous and Next?

[RoboFan]

Running RoboHelp 2020.5

Looking for a way to provide previous and next functions for TopNavigation frameless output end users.

Tried creating custom buttons/functions and setting OnClick to EVT_PREVIOUS and also EVT_NEXT for each (just a guess), but no luck.

The web browser's frame and tabs will be hidden/suppressed for end users, so they need a way - within the help system - to navigate forward and backward across topics they've opened. 

[Amebr]

Theoretically just use the standard browser javascript stuff. https://developer.mozilla.org/en-US/docs/Web/API/History_API

But given the issue with your question about closing the window, you might also need to raise with Robohelp support.