From Xojo Documentation
| This item was deprecated in version 2013r1.
Please use TargetMacOS as a replacement.
Constant As Boolean
Used to indicate that you are compiling Carbon code, which is no longer supported with Xojo.
result = TargetCarbon
|result||Boolean||Returns True if are compiling Carbon code or running a Carbon app.|
Xojo no longer builds Mac Carbon apps so this constant always returns False.