# Share Data Between Drawings and Applications [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [User Guide](Help%20System/GSTARCAD/2021/User%20Guide/(User%20Guide).md) [Reference Other Drawing Files](Share%20Data%20Between%20Drawings%20and%20Applications/Reference%20Other%20Drawing%20Files--16dd709a6545.md)An entire drawing can be attached to the current drawing as a referenced drawing (xref). [Link and Embed Data (OLE)](Share%20Data%20Between%20Drawings%20and%20Applications/Link%20and%20Embed%20Data%20%28OLE%29--99625bde184a.md)You can copy or move information from one application to another using the Microsoft Windows OLE feature. You can edit information of OLE in the original application. [DWF Underlay](Help%20System/GSTARCAD/2021/User%20Guide/Share%20Data%20Between%20Drawings%20and%20Applications/DWF%20Underlay--21fa6ce0db5e.md)Insert a DWF files as underlay. [Work with Data in Other Formats](Share%20Data%20Between%20Drawings%20and%20Applications/Import%20Other%20File%20Formats--8dbdd094d2f5.md)You can work with many types of files which are created with other applications or in earlier release of the program. [PDF Underlay](Share%20Data%20Between%20Drawings%20and%20Applications/PDF%20Underlay%20Command--c0c10ba6c22b.md) You can attach a PDF file as an underlay to your drawing. [PDF Import](Share%20Data%20Between%20Drawings%20and%20Applications/PDFIMPORT%20Command--aa8f0e9cbd7f.md) You can import a PDF file to your drawing. **[DGN File Format](DGN%20File%20Format--23b5d7208936.md)** Full DGN file format support. # ---