Defining Global Exception Classes 
Basis
Release 6.10 introduces the concept of 
class-based
exceptions. At runtime, an exception is represented with an exception
object, and is therefore an instance of an exception class. The attributes of
an exception class can contain additional information about the error.
In addition
to using pre-defined exception classes for errors in the runtime environment,
you can define your own global exception classes for special errors within
your application using the Class Builder.
The following documentation describes the steps for doing so:
· Creating Attributes for Exception Classes