said variable is also mentioned in python manual, it is probably in one or more lines of d3d's script (in case anybody wishes to read the script) and the variable, once assigned, is available by saving and reading the pz3 file.  in OS X, use BBEdit.  yeah, I just checked - it's in two lines in the script, along with a line "it's currently not possible to turn GI on/off by Poser Python".  which was the only way we could do it in poser 7.