[det]directory_index(+Dir, 
:Options)//Show index for a directory. Options processed:
- order_by(+Field)
- Sort the files in the directory listing by Field. Field 
is one of name(default),sizeortime.
- order(+AscentDescent)
- Sorting order. Default is ascending. The alternative isdescending
- name(:RenderName)
- DCG used to render a name in the table. The File is passed.