link 2 passages in diff docs?

Is it likely that DTPro will add the ability to link Passage A in Doc #1 to Passage J in Doc #2?

So you could click on a link and go back and forth?

Currently you can only link to pages of PDF documents (see contextual menu). Support for other formats (HTML, web archives & maybe RTF/RTFD) might be added to a future release but support for unknown/third-party formats is impossible.