As it happens I am investigating something like this right
now, having found several problems with the Browse Sequence
mechanism.
It isn't too much work if you plan it carefully. Here's how I
did it.
I made a couple of small images (actually I grabbed the
Back/Forward buttons from Explorer) and inserted them into one
topic, at the end of the Heading 1 which starts each topic. I set
Image_Properties > Text_Wrapping to "Right" so that they appear
in the top right-hand corner of each topic. Note that if you do
this, you must insert the Right arrow first, then a space, then the
Left arrow (without the space, RoboHelp only allowed one link for
both images). I then added a screen tip to the image "Next/Previous
in sequence". Then I added hyperlinks.
After this I was able to select both images, and use
Copy/Paste to add them to all topics. When you double-click, you
get the hyperlink properties dialog, and can correct the links. I
arranged my screen so that the relevant part of the ToC was open on
the screen, so I could see where I was in the sequence.
Of course this is a PITA and error-prone, but testing is
relatively easy, if you have Auto-synchronize_TOC in Window
Properties. The buttons are always in the same place, so you can
just click repeatedly while watching the ToC.
Success!
--- Derek