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An external reference (xref) is a kind of a block in that it is stored in the current drawing's block library. However, unlike a block, the objects associated with an xref definition are not stored in the current drawing; they are stored in another drawing file. When you create an xref, the entire contents of this other file are imported as a block. See Blocks.
Note: You can also access An external reference via Block palette.
Xrefs are usually used to display the geometry of a common base drawing in the current drawing, such as a frame. They can be taken from files any formats readable by TurboCAD LTE.Only files that have objects in Model Space can be added as Xref's.
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