You can apply the key based Gaze Scrolling in any context where mouse wheel scrolling is possible.
To scroll in the direction you desire, simply direct your gaze to where you want to go and use the "Page Down" key to scroll down or the "Page Up" key to scroll up.
For notebook users: If you can't find the Page Up/Page Down keys, simply hold down the "Fn" key and press the up or down arrow keys to scroll.
As long as eye tracking data is available, the standard functionality of the Page Up and Page Down keys will be overridden.
If you need these keys for a specific application, you can disable the key-based Gaze Scrolling for that application through the app-specific settings via the small blue icon located in the top left corner of the respective window.
To fix the scroll position, simultaneously press the "Page Up" and "Page Down" keys. A small blue circle will appear at the spot you're looking at, indicating that scrolling will stay within that area regardless of where you're looking. You can unlock the scroll by pressing both keys together again.