How do you all get on with laptops and transport fridge with associated peripherals?

I've recently had to program a few incab printers and it was a pain in the backside really for one reason or another, I won in the end!

I'm also quiet interested in Carrier and Tk software, I have seen a few screenshots but nothing in the flesh, how integrated are laptops into the brains of the big diesels, what can you see?