# ERHIGHLIGHT System Variable [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [System Variables](Help%20System/GSTARCAD/2021/System%20Variables/(System%20Variables).md) → [E](Help%20System/GSTARCAD/2021/System%20Variables/E/(E).md) **Function Description:** The ERHIGHLIGHT system variable is used to control to highlight the reference name or reference object when selecting corresponding reference content in "External Reference" palettes or drawing window. | | | | --- | --- | | Type | Integer | | Saved in | Registry | | Initial value | 1 | | Range | 0,1 | **System Variable Value:** **0:** do not highlight reference objects **1:** highlight reference objects --- ## Other versions with matching text [GstarCAD 2016](../../../2016/System%20Variables/E/ERHIGHLIGHT%20System%20Variable--9fbe84238219.md) · [GstarCAD 2017](Help%20System/GSTARCAD/2017/System%20Variables/E/ERHIGHLIGHT%20System%20Variable--9fbe84238219.md) · [GstarCAD 2018](../../../2018/System%20Variables/E/ERHIGHLIGHT%20System%20Variable--9fbe84238219.md) · [GstarCAD 2019](../../../2019/System%20Variables/E/ERHIGHLIGHT%20System%20Variable--9fbe84238219.md) · [GstarCAD 2020](../../../2020/System%20Variables/E/ERHIGHLIGHT%20System%20Variable--9fbe84238219.md)