Raising the condition causes an ATTENTION ON-unit to be entered.
If there is no ATTENTION ON-unit, the application is terminated.
Cause and syntax
The ATTENTION condition is raised when the user hits a specific
key combination to interrupt an application. The specific key is
determined by the operating system as follows:
On Windows, CTRL-BRK and CTRL-C. No ATTENTION ON-units will
be driven on Windows as a result of the user entering CTRL-BRK or
CTRL-C key combinations. The implicit action will be taken.
On the host, the ATTN key, if available.
The condition can also be raised by a SIGNAL ATTENTION statement.
On return from an ATTENTION ON-unit, processing is resumed
at a point in the program immediately following the point at which
the condition was raised.