Object Reference : Object View and Procedure Reference : System
  
 
clearhist
Clear the contents of the history attribute for system objects.
Removes the system’s history attribute, as shown in the label view of the system.
Syntax
system_name.clearhist
Examples
s1.clearhist
s1.label
The first line removes the history from the system S1, and the second line displays the label view of S1, including the now blank history field.
Cross-references
See “Labeling Objects” for a discussion of labels and display names.
See also System::label.