What is g_Forward? I tried to find the variable in the text and source code but didn't see it.

How is this interpreted as a point? : (m_near*gForward) - nearRight + nearUp

My calculation for this is:
p0(x,y,z) = (m_near, +/-nearRight, +/-nearUp)

I have the frustum pointed along the +X-Axis and will rotate it to the correct location after

Thanks, now it makes sense. I was thinking it was a floating-point value, which really threw me off.