oops! sorry about my previous post, sean, but my knowledge of modern english is far from compleat. 

perhaps one could use an analogy: poser renders may often have nostril glow, but after several years of repeated explanations on how to fix this, some users are able to render with nice shadows. 

it will be the same with poser renders using indirect diffuse light.  in the first few months, users will produce renders with weird shadows, funny-looking edges and splotches (here I'm intentionally avoiding any technical terms to describe those errors), but with succeeding patches and repeated explanations, users will be able to get rid of those items.  other users may wish to turn off indirect diffuse light, even as some users in the poser realism gallery turn off shadows and still get congratulatory responses and high ratings.

p.s. in case anybody asks, the poser disks ship with a printed manual and a quickie fold-out guide to commands, both of which are easy to read.