can someone pls tellme what dis smudge tool is and were to find it

Incidentally, seeing as that page has links to Microsoft Surface computers, I saw on Tom's Hardware a few days ago, that Consumer Reports have withdrawn their recommendation because of a number of reliability issues.  That's the first I'd heard of it, and it is nice looking hardware that I suspect the lot of Photoshop users would be very tempted by, so not good news.  I spent twenty minutes using a high end Surface Studio at MAX last year, and considering it was the high spec version, there was definitely some lag, and the brush strokes were pretty ragged.  I would strongly recommend that you try before you by if tempted, because that is a lot of money to spend if you are going to end up disappointed.  I wish I'd never bought my Cintiq Companion 2 for the same reason. 

Microsoft's Surface Computers Lose Consumer Reports Backing - Bloomberg