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1. Version check from Gestalt

   SInt32 MacVersion = 0;
   BOOL isRunningSnowLeopard = NO;
   
   if (Gestalt(gestaltSystemVersionMinor, &MacVersion) == noErr) {
       isRunningSnowLeopard = (MacVersion == 6);
   }
   
   NSLog(@"isRunningSnowLeopard %d", isRunningSnowLeopard);