A PIConstant collection maps display strings to PI-SDK enumerations. This provides a way for an application to display strings indicating choices of behavior for a user to select particular actions. The application then retrieves the associated constant and passes it to a particular method being called. A PIConstant collection contains members, stored and accessed as NamedValue objects that represent the display string (the name) and the constant (the value). A PIConstant collection is retrieved using PISDK.PIConstants.Item.