hi,

First of all, my suggestion is wrong - next line:
a = *((unsigned int *)DPTR_ADDR);
loads contents of DPTR as 'unsigned int' into variable 'a' but it exchanges high and low bytes of DPTR due Big/Little Endian discrepancy. As result, it takes DPL as high byte and DPH as low byte of unsigned int. So it is wrong; drop it.

Andrew, Andy,
The SFR definitions are contained in the reg51.h header file - so once you've #included it, you can use the SFRs like any other 'C' variable!

Sure, but DPTR is not defined in 'reg51.h'; only DPL and DPH. As result, we still need to use something like:
a = (DPH<<8)+DPL;

The way in Keil is to use 16-bit register definition:
sfr16 DPTR = 0x82;
// ...
a = DPTR;

The question: is there such way with Raisonance.

Regards,
Oleg