1 When a business chooses to hire a temp agency as a permanent employee, the business must pay the temp agency a permanent staffing fee ranging from 10-25% of the employee's first-year salary. Some large organizations have in-house temporary agencies which apply similar fees for their services. 2  For example, the University of Washington charges a 29% markup, with department's paying $18.06 per hour for a temporary employee who actually earns $14 per hour.
Interrupt chaning is a technique used to restore and call all of the interrupt handlers that share that same interrupt number. This is done by saving the previus Interrupt Routine (IR) in a function pointer. Then, installing the new handler, and calling the previus interrupt handler whenever the new IR is called.
Hardware interrupts are very important for PC's. It allows other hardware devices to signal the CPU that something is about to happen. For example, a keystroke on the keyboard, or a single clock tick on the internal timer, for example.