However, I've recently acquired a laptop - my first ever! - to take some programs outdoors, mainly astronomy related and I have a huge hole in my laptop usage knowledge. The main burning question that I need help on is some basic control functions and in particular interfaces that have a slider control. On the pc, it's simply a matter of selecting the slider and moving the mouse left or right and of course, I could buy a wireless mouse to use with the laptop but then I'd need a convenient surface to put the mouse on etc, etc.
I'm guessing that there are ways of moving these little slider things but I must be asking google the wrong questions because it doesn't seem to understand the ones I ask. I've discovered a number of keyboard shortcuts and even remembered some of them for other functions but I'm struggling with this. In case I'm not being clear the picture below is from an old version of photoshop and the sliders control red, green and blue colour channels. How do I adjust them without a mouse!?

Appreciate any help you clever people can give me!
