# PLATFORM System Variable [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [System Variables](Help%20System/GSTARCAD/2021/System%20Variables/(System%20Variables).md) → [P](Help%20System/GSTARCAD/2021/System%20Variables/P/(P).md) **Function Description:** The PLATFORM system variable is used to specify the operation system in use. (Read-Only) | | | | --- | --- | | Type | Strings | | Saved in | Not saved | | Initial value | Unknown | --- ## Other versions with matching text [GstarCAD 2016](../../../2016/System%20Variables/P/PLATFORM%20System%20Variable--2dcd475d5c15.md) · [GstarCAD 2017](Help%20System/GSTARCAD/2017/System%20Variables/P/PLATFORM%20System%20Variable--2dcd475d5c15.md) · [GstarCAD 2018](../../../2018/System%20Variables/P/PLATFORM%20System%20Variable--2dcd475d5c15.md) · [GstarCAD 2019](Help%20System/GSTARCAD/2019/System%20Variables/P/PLATFORM%20System%20Variable--2dcd475d5c15.md) · [GstarCAD 2020](../../../2020/System%20Variables/P/PLATFORM%20System%20Variable--2dcd475d5c15.md) · [GstarCAD 2022](Help%20System/GSTARCAD/2022/System%20Variables/P/PLATFORM%20System%20Variable--2dcd475d5c15.md)