# INTERFEREVPVS System Variable [GstarCAD 2022](Help%20System/GSTARCAD/2022/Index.md) → [System Variables](Help%20System/GSTARCAD/2022/System%20Variables/(System%20Variables).md) → [I](Help%20System/GSTARCAD/2022/System%20Variables/I/(I).md) **Function Description:** The INTERFEREVPVS system variable is used to specify the visual style when checking interference objects. | | | | --- | --- | | Type | Strings | | Saved in | Drawing | | Initial value | Frame | The INTERFEREOBJVS system variable can only set the visual style to save in a drawing. Users can not use the PURGE command to delete the visual style specified by INTERFEREOBJVS system variable.