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The hammer-on is achieved once you select a notice and then using another finger hammer down on a single chain. The... 

One of the major legato practices all guitarists must learn could be the hammer-on, pull-off. This system is essential since it allows for nuances in tone and expression, and because it doesn't have to pick the notes on the hammer-on or the pull-off it allows the picking hand a break. This results in a progression of notes, often called riffs. 

The hammer-on is accomplished whenever you choose a note and then using another finger hammer down for a passing fancy string. The noise of the hammered note is less obvious than the chosen note. For instance place your first finger on the 5th fret of the 3rd string, and the hammer down your third finger on the 7th fret of the 3rd string. Dont use your only quickly attack the second fret position with the tip of one's 3rd finger. This would be explained in guitar tab as 5h7 or 5 hammer 7. Since you are going to pull-off of the 7th fret in the next case keep your first finger on the 5th fret. 

The pull-off results whenever you to produce plucked note with enough power so that the second fretted note rings. This may require a slight part way motion to generate enough friction to cause the line to ring out. The sound of the pulled-off note is less pronounced since you aren't utilizing your pick to create it. This could be illustrated in guitar loss 7p5 or 7 draw 5. 

You can cause quickly note runs or notes if you incorporate these practices. Imagine when played very quickly 5h7p5h7p5 how this series of hammer-on, pull-offs would sound. In deed the hammer-on, pull-off method could be the basis for legato and most pace playing techniques. 

It takes time to master the method but it is worth the effort. [http://independent.academia.edu/AngelesGearn/Posts back braces]