To prevent spam users, you can only post on this forum after registration, which is by invitation. If you want to post on the forum, please send me a mail (h DOT m DOT w DOT verbeek AT tue DOT nl --OR-- j DOT c DOT a DOT m DOT buijs AT tue DOT nl) and I'll send you an invitation in return for an account.
Some sessions in the data connected to the same customer seem to be overlapping (see example below). How should this be interpreted? 2 browsers(windows) open at the same time?