What program do you use to view the tabs?

You can use any word processor or text editor  (like wordpad, notepad or MS word)

What's a Tablature?

Tablature or tab is a generic system of musical notation commonly written for the guitar, but it can be used for any fretted stringed instrument. It is an old notation system, much of the music for the lute and classical guitar during the renaissance and baroque eras was originally written in tablature. While standard musical notation represents the pitch and rhythm of notes, tablature gives you a visual representation of the strings and frets of the guitar and tells you where to put the fingers to produce the desired notes. Tab represents the performance of the music, rather than the music itself. Like standard notation, tablature consists of a series of horizontal lines forming a staff. Each line represents one string, so most guitar tabs have a six-line staff. Looking at a guitar tab is like looking down at the fretboard in front of you, so that the headstock is on your left and the body is on your right.