The term for pressing a key while a key is already held down. Variants include 2KRO, 6KRO, and NKRO.
## Scancode
-A 1 byte number that is sent as part of a HID report over USB that represents a single key. These numbers are documented in the [HID Usage Tables](http://www.usb.org/developers/hidpage/Hut1_12v2.pdf) published by the [USB-IF](http://www.usb.org/).
+A 1 byte number that is sent as part of a HID report over USB that represents a single key. These numbers are documented in the [HID Usage Tables](https://www.usb.org/sites/default/files/documents/hut1_12v2.pdf) published by the [USB-IF](http://www.usb.org/).
## Space Cadet Shift
A special set of shift keys which allow you to type various types of braces by tapping the left or right shift one or more times.