one of the authors of FFRender explained that poser uses GI, which includes all forms of illumination, e.g. direct, indirect et al.. there was confusion about this at the time, some believing that GI was synonymous with IBL/AO, a first-order approx. of GI.

 GIVariables were introduced in poser 7, at which time there were only 4, but now there are 7.