Hierarchy of open Data Tables

[#1]

How can I get a hierarchy of all open data tables: 
- subsets
- stacked / split table
- summary table

something like the tree structure in the main menu - or in the window list?

[#2]

in my last approach, I use @jthi 's trick to parse the enhanced log :
talk to enhanced log 

But maybe, there is a more clever approach, hacking the window list view?

Unfortunately:

... and the window list ist not listed in get Window List()

[#3]

Or specify data tables in the Get Window List() function?

Names Default To Here( 1 );
open_tables = Get Window List( Type( "Data Tables" ) ) << Get Window Title;

[#4]

Or

Names Default To Here( 1 );
open_tables = Get Data Table List();