It is often difficult to determine where one
application system ends and the next application system begins. The reason for this is
systems are often integrated to some degree with other application
systems.
It is not uncommon for different application systems to
share some application system components. These common components can
include visual objects (e.g. graphic, behaviors) computer programs and/or
databases.
For example, a single financial application might
include purchasing, payroll, accounts payable, account receivables and
general ledger functionality.
Alternatively, each of these functions could themselves
be separate, independent application systems connected via system interfaces
or somehow tightly integrated.
