Returns Ids of the currently active application-level servers registered for the service. 
   Namespace:   Autodesk.Revit.DB.ExternalService  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
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Return Value
A set of GUIDs of the application-wide active servers; the list may be empty.Remarks
 More than one application-level server can be active at a given time in a multi-server service, but it is possible that no server is active (unless the service is mandatory).