On Wed, Sep 26, 2012 at 5:09 PM, Blake Dunlap <ikiris at gmail.com> wrote: > Yep that's exactly what u and d mean and why they are used. That's what I figured, but I've not found a reference anywhere. Didn't want to find out later that most people took U as meaning facing towards Upstream or something stupid like that :-) Thanks, -- Tim:>