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March 31, 2015. 1  An IRQ (Interrupt Request) number is assigned to all the hardware devices installed in a computer that are used to input information, for example the mouse or the keyboard. On a PC, some IRQs are predefined, so the Keyboard controller is always given an IRQ of 1, for example.
The number lock key has been virtually replaced by separate navigational and numerical entry keypads. The SysRq key never had a function â it was created strictly for a future function that did not materialize. Many computer keyboards don't include a scroll lock key, although a few do, perhaps for nostalgic purposes.