Protected subsystems have many applications, from databases
to common system management situations.
One use for a protected subsystem might be a group membership
list that you want to make available to all group members. The list
contains the names, addresses, personnel numbers, and interests
of group members. When the membership list is set up as a protected
subsystem, all members of the group can read selected information
and update specific types of information.
A protected subsystem might also solve the problem of confidential
information being sent to printers in public areas. You could write
an application to filter data for sensitive information. Confidential
files would be sent to printers in restricted areas, while public
files would be sent to any available printer. Any user with execute
access to the application could use the restricted printers, but
only through the protected subsystem.
HP OpenVMS Guide to System Security
Security for the System Administrator
