Bending strings behind the nut definitely has its uses :l.
Squeal as in pinch harmonics or feedback?
Both techniques are easy enough-- Problem for me is I rarely get my amp loud enough to pull off sickly screams. It's all about treble and volume though.
Viper
that they do...
also how well can you squeal on your guitar?
i can do it anywhere on the neck and even by bending the strings behind the nut ._.