Chain - Draw a chain like drawing a line.  From point to point to point.  This program uses two blocks, chain1.dwg (the open link) and chain2.dwg (the closed link).  The closed link has a wipeout behind it to trim the open link.  You will have to have the wipeout enabler installed for Release 14 thru 2002.  You can get this at Autodesk.com.   See other notes about the program inside the CHAIN.lsp file.