Removes objects from a drawing.

Customizes the program settings.

Restores erased objects.

Reverses the effects of previous UNDO or U command.

Reverses the effects of several previous UNDO or U commands.

Reverses the most recent operation.

Reverses the effect of commands.

Indicates the state of the Auto, Control, and Group options of the UNDO command.

Stores the number of marks placed in the UNDO control stream by the Mark option.