[koreabell]

most of the joysticks have number on each button, maybe except for trigger button and, if you're using logitech joystick and cannot figure out which button is which, install logitech gaming software that came with the joystick(to computer), execute it with joystick plugged in to one of the computer's usb ports, and start pressing buttons. the program will tell you what button you're pressing.

i don't know if other companies support those kind of software or not, but if you have logitech joystick, you can figure out that way

if you're making your own usb joystick, then you'll have to label it as you make it, but if you're buying joystick, then i wouldn't worry too much about not knowing which button is which

btw, if you want to test without robot or drivestation, run joystick-playable game and go to key configuration(or something like that), and try changing joystick key. it'll show you which button you pushed after you assign a key (for most games)