Moving, copying, and stretching are, for many drafters, the three most common editing operations. AutoCAD obliges this need with the MOVE, COPY, and STRETCH commands.
The MOVE, COPY, and STRETCH commands all require that you specify how far and in what direction you want the objects moved, copied, or stretched. After you've started the command and selected the objects to be edited, AutoCAD prompts you for two pieces of information:
Specify base point or [Displacement] <Displacement>: Specify second point or <use first point as displacement>:
In a not-so-clear way, these prompts say that two possible methods exist for you to specify how far and in what direction you want the objects copied, moved, or stretched:
How does AutoCAD know whether your response to the first prompt is a base point or a displacement? It depends on how you respond to the second prompt. (Is that confusing, or what?) First, ...