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no idea! it's just an assembly program
i wanted to know what it is because i'm having some bugs and i've had trouble before with the oscal, so i thought that this too might have a crucial part in the functionning of my program
You're still giving no real clue as to what you're asking, based on your original post it gave the impression that you were referring to the checksum in the HEX file, used during programming of the chip. It in no way affects the program, it isn't even part of it - just a check between programmer and PC.
Once you've programmed the chip, do a verify on it - if it's verifies OK, then it's loaded correctly. Any bugs are almost certainly ones you've written in the program, it would be VERY rare for incorrect loading to create a bug, and not give an error.