Page:Scheme - An interpreter for extended lambda calculus.djvu/30

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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 T every so often, used to drive the scheduler.
This register always contains the name of the process currently swapped in and running.