This method will simply switch the active state of a server without affecting in any way the other servers. 
   Namespace:   Autodesk.Revit.DB.ExternalService  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 22.0.0.0 (22.1.0.0) 
  Since:  2013 
Syntax
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Parameters
- serverId
-  Type:  System Guid  
 Id of the server to switch active state for.
- document
-  Type:  Autodesk.Revit.DB Document  
 Document for which to activate this server. If null, server will activate globally.
- bActive
-  Type:  System Boolean  
 True to activate server, false to deactivate.