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subsystem. For you to get to this screen you have
to enter through the main menu for the SFM
subsystem (choosing option PF5) shown in
figure 10-6.
SUBSYSTEMS RELATIONS
The various subsystems that make up SNAP
II are somewhat related to each other. For
instance, the SMS subsystem basically allows
the user access to all the other subsystems.
Also, the MDS and the SFM subsystems interact
directly with each other. Otherwise, all the
other subsystems work independently of each
other. However, when you request a printout of
a report or file, you must go to the SMS to ac-
tually get the system to print out the requested
file or report. Each one of the subsystem man-
agers is responsible for entering all users into their
subsystems.
SECURITY
The SNAP II system supports both access se-
curity and functional security within each subsys-
tem. The system is based on the concept of a user’s
authority to perform a given set of functions and
makes only this set of functions available to the
user. This involves not only exclusion from execu-
tion outside this set but also the support of
a menu-driven system that tailors the menu for
each person. Each subsystem provides a specific
security mechanism appropriate to its function.
Since everyone aboard your ship is a poten-
tial user of some functions in SNAP II, a flexi-
ble facility accordingly controls particular user
access to the system. One very important thing
to remember is that when you use the system, do
not let anyone use your password. You could have
greater access to the system than he or she might
have. You should change your password period-
ically as per your TYCOM directives.
10-10
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