Well - not REALLY a bet... however one of my coworkers appears convinced - or had HEARD - that ArchiCAD's kernel (my words) was written in BASIC - and thus assumed that it is also COMPILED in BASIC.
I'd have assumed that the original program was written and compiled in either FORTRAN (such was the fashion at the time, no?) or C. Can you solve this question - just for the sake of our curiosity.
thanks
Jonathan