Hi,
I guess you're talking about EFB here. Do a google search on EFB and you will find out which airline uses which EFB.
What processors do they have?
RAM?
> depends. class 1, 2, 3 have dif specs & even amongst dif brands there's differences. Specs is not the only concern here, usability and intuitiveness, how much back-office ops work it can do, etc
Who build them? (Microsoft, that would excite me)
> Boeing has more than 90% market share through the company it controls, jeppesen
How much?
> can be really expensive or dirt cheap