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Your system can include more than one Data-Admin-System
      instance. However, only one is in current use, identified by the
      Identification/SystemName value in the
      prconfig.xml file.
The system name IWM is reserved for use with the Integrated Work Manager. Do not choose the name IWM in other situations.
For systems installed with Version 5.X and 6, the default system ID is
    pega. A second system ID, prpc, is reserved for special situations. . 
                 For systems installed with Version 4., the default
 system ID is
For systems installed with Version 4., the default
 system ID is wfe for Work Flow Engine.
|   | Integrated Work Manager, node, System ID | 
|   | Multinode
 clusters — Concepts and terms When and how to change a system name |