Button 1 is the left mouse button, which is normal. If you want to change it, go to the options.
In Project64, the default controls for the keyboard are typically as follows: Arrow keys for movement, "Z" key for A button, "X" key for B button, "Enter" key for Start button, "Ctrl" key for L button, "Alt" key for R button, and the numeric keypad for C buttons. These controls can be customized in the input settings of the emulator.
Volume
Just press options... go-to controls and fix there.
On default controls, click in the Right Joystick.
A big red button is a real, fictional, or figurative button which controls a function of critical importance in a given situation.
To fire it press the shoot button and move it with the move controls (not aim)
i usually press the a and the b button as fast as i can. i use to do it with just the b button, but it seems to work better if you use both.
The action button is a button on your controller that accesses buttons, controls, basically, ANYTHING that the game will let you do. On PlayStation, the action button is The square button. On Xbox, it is the x button. On wii it is the A button, ds, wii, and PC, I am not sure.
Directional Pad = Arrow keys A-button = Z B-button = X L-button = A R-button = S Start-button = Enter/Return Select-button = Backspace/Delete
In DeSmuME, the select button is typically mapped to the keyboard's "X" key by default. However, you can customize the controls through the emulator's settings by navigating to Config > Control Config. There, you can change the key assignments for the select button and other controls to suit your preferences.
Just select each button and hit the Close button. The emulator will automatically remember those settings.