Yielding the flow of program control to a block which was provided at calling time:

On some machines, certain lights and switches were reserved for use under program control.

The system became known as stored program control.

There are basically two approaches to organizing stored program control: centralized and distributed.

Data was read and written from the papertape punch under program control.

This procedure gives the calling program control over the environment of the called program.

Some flags are set or reset under program control.

The operation is begun by an instruction and proceeds basically independent of program control.

A statement which transfers program control to a line with a specified or calculated line number.

Mueller concluded he would have to "teach people what was involved in doing program control."