> When TThread.Priority will be implemented ?
When someone finds it important enough to make an implementation.
> Why not give a compiler message that TThread.Priority is not yet implemented
> when using it ?
1. AFAIK it is implemented for windows, but this must be checked.
2. TThread relies on the underlying threadmanager to do the actual work.
The compiler therefor does not actually know if it is implemented when
you use it.