The use of atomic weapons at the end of World War 2 fostered fears about their potential use during the Cold War years.
Interrupts and signals are low-level mechanisms that can alter the flow of control in a way similar to a subroutine, but usually occur as a response to some external stimulus or event (that can occur asynchronously), rather than execution of an 'in-line' control flow statement.
A control used on a form, report, or data access page to display or modify data from a table, query, or SQL statement. The control's ControlSource property stores the field name to which the control is bound.