It is possible to demonstrate this behaviour by one of the forrrest "seed sample sites".
1.) forrest seed
2.) add the pdf-tab support as described in http://forrest.apache.org/docs_0_80/howto/howto-pdf-tab.html
3.) some additional stylesheets are needed (after the seed only hello2document.xsl is present). Therefore I copied all stylesheets from %FORREST%\main\webapp\resources\stylesheets to the seeded project
4.) to produce one page for the whole sample1-tab add the wholesite-tag to the site.xml like this
<samples1 label="First set of Samples" description="First Set of Samples" wholesite="true">
5.) forrest run ;-)
6.) open the url http://localhost:8888/pdf-tab.html
For example the links the list "Documentation contained in Samples 1" in the section "Samples 1 Documentation" are broken as described.