question on gl

[Andrew V. Royappa]

The gl graphics user's guide says that the perspective & viewing
transformations transforms the perspective pyramid into the box 
-1.0 <= x,y,z <= 1.0, to facilitate clipping. Is this in fact
the case, or are the box's bounds given by something else
e.g. -1.0<=x,y<=1.0 and 0.0<=z<=1.0 ? 

			Thanks,

				Andrew
				avr at purdue.edu
				{pur-ee,ucbvax,decvax}!purdue!avr