UNDOCTL System Variable

GstarCAD 2026 → System Variables

Function Description:

The UNDOCTL system variable is used to display options used in UNDO command.
(Read-Only)


Type	Integer
Saved in	Not saved
Initial value	53

The setting is stored as a bitcode using the sum of listed system variable values.

System Variable Value:

0: turn off UNDO
1: turn on UNDO
2: only one command can be undone
4: Auto is turned on
8: one group is active
**16:**treat ZOOM and PAN as one single action
32: Layer property operations are grouped as a single action