How to tread the different memory spaces?

Hello,

Suppose you declare an array in a certain memory space, for instance

unsigned char xdata SendBuffer[ 20 ];

.
Is it allowed to just prototype the callees with

byte *SendBuffer

and dereference it as

TempVal = *( SendBuffer + Counter );

?
Or should it be casted to the correct memory space, like

TempValue = *( (unsigned char xdata*)SendBuffer + Counter );

?
In other words, is the Keil compiler 'clever' enough to see the memory space in the called functions and do the correct memory space conversion itself?
That means, if I declare my SendBuffer in

idata

, will it also work correctly with the same prototype for the callees?

I've run the PC simulator and it seems it works fine, but I just want confirmation.

Rgds,

Geert