# XOPEN Command [GstarCAD 2018](Help%20System/GSTARCAD/2018/Index.md) → [Commands](Help%20System/GSTARCAD/2018/Commands/(Commands).md) → [X](Help%20System/GSTARCAD/2018/Commands/X/(X).md) The XOPEN command is used to open selected drawing reference (external reference) in new window **Command Access:** > **Command:** XOPEN Command Prompts: > Select Xref: Function Description: Users could use this command to edit specified drawing reference in separated window. ## Other versions with matching text [GstarCAD 2016](../../../2016/Commands/X/XOPEN%20Command--cc62559b5446.md) · [GstarCAD 2017](../../../2017/Commands/X/XOPEN%20Command--cc62559b5446.md) · [GstarCAD 2019](../../../2019/Commands/X/XOPEN%20Command--cc62559b5446.md) · [GstarCAD 2020](Help%20System/GSTARCAD/2020/Commands/X/XOPEN%20Command--cc62559b5446.md) · [GstarCAD 2021](../../../2021/Commands/X/XOPEN%20Command--cc62559b5446.md)