|Sussman and Steele||December 22, 1975||29||Implementation of the Interpreter|
- A super-temporary register, used for random purposes, and not saved in
**CLINK**frames or across interrupts. It therefore may not be used to pass information between "instructions" of the "machine", and so is best thought of as an internal hardware register.
- A list of all processes other than the one currently being interpreted.
- A magic register which a "hardware clock" sets to
Tevery so often, used to drive the scheduler.
- This register always contains the name of the process currently swapped in and running.