Rewind film

As far as I know, not all cameras have the option to rewind before shooting the whole roll. I have a Canon that has a small button on the bottom of the body, you push it in with a pen or something similar, to rewind. With the Nikon N80 you press the flash button on the back left of the body (next to the bracketing button) and the light button next to the digital screen on the top right, simultaneously, to rewind.