Do slate-style tablet PCs offer an onscreen keyboard?

I am getting a slate-style tablet PC and have a few questions:

1. Is using a stylus the only option for control or can you use your finger to operate the touch screen?

2. If you can use your fingers on the touch screen, do any tablet PCs offer an onscreen keyboard that can be typed on with your fingers as if you were typing at a normal computer?

I'd be very interested to know brands, models, programs, etc that offer this functionality. I am not interested in the convertable-style (with flipable screen) tablet laptop, it has to be slate-style for what I need it for.

Cheers guys 🙂