Nope this type of functionality is strictly hardcoded within the program.
One area that is a little similiar is the Help/Tips files. If you look at the code you will see an <A HREF> line with some unusual parameters.
I believe the tag parameters are actually a call to open another window. Still working on testing. Can I open other UI windows? can I open a totally player created UI window? Can these type of tag be used in the Storys?
Looks promising but haven't done much testing yet.