Guitar playing: on the frets themselves

[DavidC]

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i do stuff like that when i play by myself to try and make different sounds etc... but i couldtn say i've heard it in any songs.

although i wouldnt doubt someone out there has put it in somewhere.

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Another thing that you can do is pluck a string, then just touch it gently with the top side of your finger nail, near the outter end of the string (away from the sound board).

also, if you pluck a string up higher (towards the keys?) than you normally would, it makes a different sound.

What do you guys mean by "high action", exactly?