Downloading program to internal/external flash

Hello All,

I'm using AT89C5131 which has 32Kx8 of internal flash memory. I'm also adding a 32Kx8 external flash.

How does the programming work with Keil?
I mean how does Keil know to program the first 32Kx8 in internal flash and the next 32Kx8 to the external flash?

Thanks