How to use a curve to control hair form?

http://www.cgarena.com/freestuff/tutorials/nightmareChallenge/n1/index2.html
This tutorial seems to use this technology

that tutorial is quite outdated, from before 2.46. Now you can use the particle mode to edit the hair.
http://wiki.blender.org/index.php?title=Doc:Manual/Physics/Particles/Particle_Mode

oh!i see,thank you :smiley:

no problem! :slight_smile: