How do I register multiple key presses?

Specifically, I need the game to register when the A, L and K buttons are pressed but this combination of keys doesn't seem to work together. Once the A and L buttons are held down, the K won't register. Is this just an issue with my keyboard or is it global? I know there are other three-key combinations which will work but I ideally need it to be these three keys (I won't bore anyone with a long description of my game but it's a finger-twister sort of thing).

Any advice or suggestions will be greatly appreciated. I can post a capx if that helps.

Thanks!

here http://gyazo.com/708d57d0f602989e0a5682783cb7ce6d

Thanks very much, but I'm afraid that doesn't work. If A and L are down (in the game, they need to be continuously held down for much of the time) then it will not register K being pressed or held down. Most other keys will register fine in the same circumstances.

That's a hardware wiring issue I think. Most keyboard don't allow more than two keystrokes at once (with the exception of ctrl, alt, shift). So pressing A, L and K at the same time isn't technically possible. I think there are keyboards that allow multiple simulatenous keystrokes but it's not standard.

https://en.wikipedia.org/wiki/Rollover_(key)

I was hoping that wasn't the case but thanks very much for settling it for me! I'll have to work the game mechanics in a slightly different way all round as I don't want to risk some players being locked out due to their keyboards.

its working fine on me also what eliasfrost said non mechanical keyboards have limitations on keystrokes so you have to to think for a work around