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I am interested in learning ObjectARX. The text I purchased says that ObjectARX 2000 must be installed. Is ObjectARX included with AutoCAD or must it be purchased separately? If included where is it or how do I install?

I would like to create code to manipulate a .shx file manually. Can someone point me to a good text on font file format?

Does anyone know what the current requirements are for smoke evacuation/compartmentation systems in high-rise buildings in the city of Houston. I can see that stairwell pressurization is required, but don't see any requirements for compartmentation or pressure differentials between floors in...