cross-refs: navigate from target back to source

[eNGiNe]

On page 20, let's say, the author has helpfully included a cross-reference like "See §5.8 on page 157". Ctrl-Click to follow link suggests the tool-tip, and this does the job. But having now arrived at page 157, how do I get back to page 20 to carry on reviewing the list of links? Hope I'm missing something simple :-}