A routine update can happen at any time and is basically invisible to most
of the customer base. These changes happen all the time: updating the contents
of a directory server or an authentication database, helping an individual
customer to customize his or her environment, debugging a problem with a
desktop or a printer, or altering a script that processes log files to produce
statistics. You do not need to schedule a routine update; the scope of the
problem that an error would cause is very limited because of the nature of
the task.