# I [GstarCAD 2018](Help%20System/GSTARCAD/2018/Index.md) → [System Variables](Help%20System/GSTARCAD/2018/System%20Variables/(System%20Variables).md) ## Topics - [IMAGEFRAME System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/IMAGEFRAME%20System%20Variable.md) - [IMAGEHLT System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/IMAGEHLT%20System%20Variable.md) - [IMPLIEDFACE System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/IMPLIEDFACE%20System%20Variable.md) - [INDEXCTL System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/INDEXCTL%20System%20Variable.md) - [INETLOCATION System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/INETLOCATION%20System%20Variable.md) - [INPUTHISTORYMODE System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/INPUTHISTORYMODE%20System%20Variable.md) - [INSBASE System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/INSBASE%20System%20Variable.md) - [INSNAME System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/INSNAME%20System%20Variable.md) - [INSUNITS System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/INSUNITS%20System%20Variable.md) - [INSUNITSDEFSOURCE System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/INSUNITSDEFSOURCE%20System%20Variable.md) - [INSUNITSDEFTARGET System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/INSUNITSDEFTARGET%20System%20Variable.md) - [INTELLIGENTUPDATE System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/INTELLIGENTUPDATE%20System%20Variable.md) - [INTERFERECOLOR System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/INTERFERECOLOR%20System%20Variable.md) - [INTERFEREOBJVS System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/INTERFEREOBJVS%20System%20Variable.md) - [INTERFEREVPVS System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/INTERFEREVPVS%20System%20Variable.md) - [INTERSECTIONCOLOR System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/INTERSECTIONCOLOR%20System%20Variable.md) - [INTERSECTIONDISPLAY System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/INTERSECTIONDISPLAY%20System%20Variable.md) - [ISAVEBAK System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/ISAVEBAK%20System%20Variable.md) - [ISAVEPERCENT System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/ISAVEPERCENT%20System%20Variable.md) - [ISOLINES System Variable](Help%20System/GSTARCAD/2018/System%20Variables/I/ISOLINES%20System%20Variable.md) - [System variable with I letter](Help%20System/GSTARCAD/2018/System%20Variables/I/System%20variable%20with%20I%20letter.md)