Tipster R. Clayton Harrison shares a system variable tip that will save you a step when editing polylines in AutoCAD.
"I was looking for a LISP routine that would join two or more regular lines without the annoying prompt, 'Object selected is not a polyline. Do you want to turn it into one?' I came across the variable PEditAccept; setting it to 1 suppresses the display of the prompt. Now PEdit works like I want it to, and there is no need for a LISP routine."
Notes from Cadalyst Tip Reviewer Brian Benton: This is an annoying prompt. Of course I want to convert these objects to polylines — that's why I started this command! PEditAccept is one of the first settings I change when I install AutoCAD.