RPL Debugging, Bitmaps Panel
The Bitmaps Panel displays the various bitmaps which may appear in the Stack or TempObj Panels. 

On the left side of the panel is a list of all bitmaps currently shown in the various panels on the RPL Debugging Window.  Clicking on one of these entries will display that bitmap's picture in the control.  Each entry in the list is identified with a number, this number identifies the bitmap in the other RPL debugging Window Panels.

Array Identifying Numbers
The identifying numbers for the arrays are also shown in the other panels of the RPL Debugging Window.  For example in this Stack Panel Grob 1 is referenced. 

In this TempObj Panel, there are 6 different grobs listed (Grob 7 shown in the picture).  Clicking on Grob 7 in the Bitmaps Panel displays that bitmap.  The Bitmap panel also shows that Grob 7 is a 21*8 (21 dots by 8 line bitmap).