"Constrain to line" shortcut?

ChaosEidolon

Ok, i feel like a total noob asking this, but what is the shortcut key for "constrain to line/surface" or whatever it is that makes your verts/lines move along that axis.

Ive been hitting it my accident a lot lately and then i cant figure out how to turn it off

Edit: I should probably mention that im using 3d Studio 7

MoP

Shift-X, I believe.

ChaosEidolon

ur my hero