TDbAdvGrid: get actual displayed rownumbers

How can I get the actually displayed row-numbers?

 
Example: I have 1000 rows and can display 10 rows in a TDbAdvgrid. Now I need to know that rows 475 - 484 are displayed actually (Page-Mode = false).
 
Thanks, Peter

Especially when you work with a non-sequenced dataset, there is no way to get this info, this is rather a limitation of the database (TDataSet) than from the grid.