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

     A super-temporary register, used for random purposes, and not saved in  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  every so often, used to drive the scheduler.    <dd> This register always contains the name of the process currently swapped in and running. </dd> </dl>