# CTAB System Variable [GstarCAD 2020](Help%20System/GSTARCAD/2020/Index.md) → [System Variables](Help%20System/GSTARCAD/2020/System%20Variables/(System%20Variables).md) → [C](Help%20System/GSTARCAD/2020/System%20Variables/C/(C).md) **Function Description:** The CTAB system variable is used to control to display model tab or specified layout tab in drawing area. <table><tbody><tr> <th>Type </th> <td><p>Strings </p></td> </tr> <tr> <th>Saved in </th> <td><p>Drawing </p></td> </tr> <tr> <th>Initial value </th> <td><p>Model </p></td> </tr> <tr> </tr> </tbody></table> The CTAB system variable is usually used in customized programs. --- ## Other versions with matching text [GstarCAD 2016](../../../2016/System%20Variables/C/CTAB%20System%20Variable--d58b40c7186e.md) · [GstarCAD 2017](../../../2017/System%20Variables/C/CTAB%20System%20Variable--d58b40c7186e.md) · [GstarCAD 2018](../../../2018/System%20Variables/C/CTAB%20System%20Variable--d58b40c7186e.md) · [GstarCAD 2019](../../../2019/System%20Variables/C/CTAB%20System%20Variable--d58b40c7186e.md) · [GstarCAD 2021](../../../2021/System%20Variables/C/CTAB%20System%20Variable--d58b40c7186e.md) · [GstarCAD 2022](Help%20System/GSTARCAD/2022/System%20Variables/C/CTAB%20System%20Variable--d58b40c7186e.md)