On Jan 28, 2008, at 6:54 AM, John McKernon wrote: > Does anyone know if there is any way to determine in code whether > or not an > FB app is running under Rosetta on an Intel processor? John, 1) Given an FB app built with the FB compiler and not FBtoC, it has to be a PowerPC executable. 2) A PowerPC executable will run native on a PowerPC machine and under Rosetta on an Intel machine. 3) Given #1 is true, the only thing remaining to find out is if the program is running on an Intel or PowerPC machine. Alain's Gestalt calls look reasonable for this discovery. If the FB app is universal (i.e. created by FBtoC) it will obviously never run in Rosetta. Brian S.