Am Monday 06 August 2012 21:18:20 schrieb Rainer Stratmann: > Am Monday 06 August 2012 20:15:53 schrieb Martin: > > I do not understand this ... > What is the content of the stack? > Which file 'f'? > Is it read from or write to file 'f'? Ok write to file 'f'. :-) But I still do not understand.