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Take a look at "123 PIC Microcontroller Experiments for the Evil Genius", by Myke Predko. It might suit your needs.
The two compilers are not all that different. If you take a look at a few c programs written in HiTech you should be ok.
/* Definitions for PORTA register */
extern volatile near bit RA0 @ ((unsigned)&PORTA*8)+0;
extern volatile near bit RA1 @ ((unsigned)&PORTA*8)+1;
extern volatile near bit RA2 @ ((unsigned)&PORTA*8)+2;
extern volatile near bit RA3 @ ((unsigned)&PORTA*8)+3;
extern volatile near bit RA4 @ ((unsigned)&PORTA*8)+4;
extern volatile near bit RA5 @ ((unsigned)&PORTA*8)+5;
extern volatile near bit RA6 @ ((unsigned)&PORTA*8)+6;
extern volatile near bit RA7 @ ((unsigned)&PORTA*8)+7;