No comment. Sorry.

	printing
	printOn:

	accessing	top
	stepTime Return the step time for this message. If nil, the receiver of the message will be asked for its #stepTime.
	stepTime: Set the step time for this message. If nil, the receiver of the message will be asked for its #stepTime.

	printing	top
	printOn: Append to the argument, aStream, a sequence of characters that identifies the receiver.

	instance creation	top
	scheduledAt:stepTime:receiver:selector:arguments: