File name of current document

Hello friends,

Now that I have managed to find citations (special strings) in paragraphs, footnotes, tables and table footnotes - all with your generous help - I need to find out the file name (path) of the current document (or book).

All that i have found is how to get the file name of a book component (well, that i'll need also, but later).

How can I find the file name of the current document (that is not part of a book) and

How can I find the file name of the current book?

Thanks again for Your help

Klaus