A process can send the XCPT_SIGNAL signal exception to another process by calling DosSendSignalException.
In order for the specified process to receive the exception, it must have an exception handler registered for Thread 1, and it must designate itself as the signal focus for its screen group by calling DosSetSignalExceptionFocus.
Presentation Manager applications cannot request exception focus for Ctrl+C and Ctrl+Break. However, establishing an exception handler for Ctrl+C and Ctrl+Break is supported for Vio-Window and full-screen applications.