Inserts an external reference, image, or underlay (DWF, DWFx, PDF, or DGN files) in the current drawing.
Insert a DGN file as an underlay into the current drawing.
Insert a DWF or DWFx file as an underlay into the current drawing.
Opens the External References palette.
Inserts a reference to an image file.
Insert a PDF file as an underlay into the current drawing.
Inserts a DWG file as an external reference (xref).