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This is the DEFINE_EVENT block in Form B:

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   define_evt name(employee_created)

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   define_map *input class(#empno) name(#this_emp)

FormB also has a SIGNAL command which signals that the event has been triggered and passes the employee number of the new employee to the event routine:

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   signal event(employee_created) this_emp(#empno)

The owner form of  Form B has an event routine for the employee_created event which receives the employee number and maps it to a variable #TheValue and then assigns this value to field #empno on the owner form.

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   EVTROUTINE HANDLING(#FormB.employee_created) this_emp(#TheValue)

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      set com(#empno) value(#TheValue)

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   ENDROUTINE