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The book of rules which we have described our human computer as using is of course a convenient fiction. Actual human computers really remember what they have got to do. If one wants to make a machine mimic the behaviour of the human computer in some complex operation one has to ask him how it is done, and then translate the answer into the form of an instruction table. Constructing instruction tables is usually described as «programming». To «programme a machine to carry out the operation A» means to put the appropriate instruction table into the machine so that it will do A.

An interesting variant on the idea of a digital computer is a «digital computer with a random element». These have instructions involving the throwing of a die or some equivalent electronic process; one such instruction might for instance be, «Throw the die and put the-resulting number into store 1000». Sometimes such a machine is described as having free will (though I would not use this phrase myself). It is not normally possible to determine from observing a machine whether it has a random element, for a similar effect can be produced by such devices as making the choices depend on the digits of the decimal for π.

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