Bjorn. Concern about the number of files. The 2Gb issue is not anymore
relevant, probably one can keep everything in one event.

Rene is in favor of the split file system. The only concern is when
we have small events, they should be correctly put in groups. 

Fed. We take as order of magnitude a central event. Then the time to
access files is negligible. If the dir. contains range of small
events, we will keep the contain consistent with a central event. 

The avant age of the split files is that it minimizes possibility to
make error and to corrupt the data. 

Jiri. Which class is responsible for the writing of general data? It
is the main point for the discussion after the presentation. 

Piotr. Question about the situation when we have more then one event
in the memory, for example during the Merging. Yuri - we need only the
sDigits of the two events. By default we read the header of the signal
event. For the merging I read also the sDigits. 

Marian. Is it possible to open the sDigits trees from the signal and
the background event at the same time? Yes, it is.  

The name of the sDigits folder is taken from the full path name. There
is one background event and several signals which are merged to, but
they are not considered as events. For the signals one needs only
sDigits.