The following classes are supplied as part of Synergy DBL. These class names can be abbreviated to the part of the name that follows the last period. For example, System.String is String, Synergex.SynergyDE.SynException is SynException, and so on.
The fully abbreviated forms of these classes can only be used where they are unique within all imported namespaces. For example, the ArrayList abbreviation requires the import of either System.Collections or Synergex.SynergyDE.Collections, but not both.
Also refer to your .NET Framework documentation.