UNDOCTL system variable
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 could be undone
4 : only one command could be undone
8 : one group is active
16 : treat ZOOM and PAN as one single action
32 : treat ZOOM and PAN as one single action