-XREF command
Attaches and detaches DWG files.
                Alias: -XR
Description
Controls DWG drawing files that are attached to the current drawing (short for "external reference").
Options within the command
- ? to list external references
 - List the names and paths of attached drawings, if any, and their status.
 
- Attach
 - Opens Select File to Attach dialog box to select a DWG file to attach.
 
- Overlay
 - Opens Select File to Overlay dialog box to select a DWG file to overlay.
 
- Bind
 - Copy the contents of the attached drawing to the current drawing as entities or as a block, depending on the value of BINDTYPE system variable:
 
- Detach
 - Remove attached drawings.
 
- Path
 - Changes the path (drive and folder) to the source DWG file, should the original path no longer point to the file.
 
- Reload
 - Reload the attached drawing, after its contents have changed.
 
- Unload
 - Hide the attached drawing from view, but keep it attached.