May I know if its possible to create a csv at run time and write some info (like title, pagenum, etc) to it? I created a simple scenario below for easy understanding.

roottag:before{
    content: prince-script(openfile, page)
}
section, chapter, backmatter{
    content: prince-script(writefile, page, content())
}
function openfile(){
   var file = new File('c:\test.csv');
    file.open('w');
    file.close();
    return null;
}
function writefile(page, text){
    file.open('a');
    file.write(page + ' - ' + text);
    file.close();
    return null;
}

Kindly let me know your thoughts?

Prince doesn't support the File API, but you can write to the console. However it may be easier to do this by iterating over the box tree in the oncomplete event handler instead of using prince-script.