Initial user
From Amahi Wiki
When apps display an "Initial user" login information, it has been pre-set for you so that the application is ready to go by the time it is installed.
This is typically the information for the initial user, typically an "admin" user with extra privileges, so it has to be handled carefully.
It's strongly recommended that you change this password as soon as possible in the application itself (unless you do not have your HDA in a place that requires much security).
