Frequent tipster Leonid Nemirovsky shares a way to copy objects between open AutoCAD files.
"If you have a couple of drawings open and you can see all of them on the screen, you can copy objects simply by dragging them from one drawing to the next."
Notes from Cadalyst Tip Reviewer Brian Benton: To get this tip to work, first select the object you want to copy. Then right-click and hold the mouse button down. Drag the object to the other drawing where you want it to be copied to, and release. You will see these options: Move Here, Copy Here, Paste as Block, and Cancel. This method will work across open files, multiple instances of AutoCAD, and even in the same drawing tab.