Poser 7 does not have IDL

IDL starts from Poser8 onwards, and it is in the render settings.

With soms tricks you can "fake" IDL.
Do a search here on AO "Ambient Occlusion" and you'll find everything you need.
But IDL is far better in Posers latest versions updated with the latest SR's.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!