The Set property returns TRUE when the referenced object property is changeable.
object.Set
object
Expression that evaluates to an object in the Applies To list
Boolean
Read-only
When TRUE, the property referenced is read/write or write-only. However, an application attempt to change the property value is not guaranteed to succeed. Constraints for the referenced object property, such as properties that can only be set prior to Microsoft® SQL Server™ component creation, can cause a property change to fail.
When FALSE, the property referenced is read-only.