(44 . 6)(44 . 10)
   -- The 'zero' position, as with the Data Stack, indicates 'emptiness'
   -- when pointed to by CSP ( see ffa_calc.adb ) and is never accessed.
   
   -- Valid indices into the Subroutine Table:
   subtype Subroutine_Table_Range is Natural range 0 .. Subroutine_Table_Size;
   -- The 'zero' position indicates 'emptiness', as in the above.
   
   -- Ensure that requested Peh Dimensions are permissible. Terminate if not.
   procedure Validate_Peh_Dimensions(Dimensions : in Peh_Dimensions);