Which key is the "Intro" key? I'm not familiar with that one. Also, could you list the mouse controls? I don't have the game currently installed.
The large key under the "+" key, on the numpad, if you've a laptop, you won't have it.
The key's name is "Intro" under spanish keyboard layout, Key's name is "Enter".

As for the mouse:
- Left Button: Shoot Primary Weapon (lasers)
- Right Button: Shoot Secondary Weapon (missiles, bombs etc.)
- Middle Button (or Wheel button): Same as 'H' (Target Next Hostile)
If your mouse has more buttons, FS2 has default mappings for them, but I don't remember which buttons do which actions.