Developing Drawing Strategies: Part 1 - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 147

As you can see, as long as you know the scale factor, it's easy to use the SCALE
command to resize objects in your drawing. The next door to draw is the sliding
glass door. This kind of door requires an entirely different strategy, but you'll use
commands familiar to you by now.
Drawing a Sliding Glass Door
You will need to use the Endpoint osnap a lot while creating, copying, rotating,
and mirroring objects; it's probably the most frequently used of the osnaps. Rather
than activating it as needed, you will turn on Endpoint as a running osnap—an
osnap that is permanently turned on.
1. Continue using 04A-FPLAY5.dwg , or open it if it's not already open.
2. Right-click on the Object Snap button in the status bar, and then
select the Settings option in the context menu.
3. In the Object Snap tab of the Drafting Settings dialog box, check the
Endpoint option.
While the cursor is near the selection, a tooltip appears describing
the features to which the osnap moves the cursor. Take a moment to
investigate what each of the osnap options does before clicking the
OK button (see Figure 4.61).
FiGuRE 4.61 The Object Snap tab of the Drafting Settings dialog box
4. The osnap is active, but the running osnaps are not turned on. Click
the Object Snap button to turn on (light blue background) running
osnaps. Now whenever you are prompted to pick a point, a marker will
appear over the nearest endpoint of the object the cursor is over.