In our previous episode, Rainer Stratmann said:
> > Example of this "no effect"? {$H+} should do it.
>
> Is it global (for all sourcefiles) if put on top of the first sourcefile?
No. This can be easily seen that if one would first compile files 2..5 and
only then 1, while compiling 2..5 the compiler would not know about 1 if
2..5 don't USES 1.