AutoCAD 2008 User's
Guide > Share Data Between
Drawings and Applications > Reference Other
Drawing Files >
Update and Bind Referenced Drawings
Beyond attaching and detaching referenced drawings (xrefs), you can also update and bind drawing references.
Attached DWG references (xrefs) can be nested: that is, you can attach an xref that contains another xref.
When you open a drawing, all DWG references (xrefs) update automatically. You can also update xrefs whenever you want to ensure that the most current versions are displayed in your drawing.
When you archive final drawings that contain xrefs, you can choose how you store the xrefs in the drawings.
