Backward and Forward Compatibility
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·Administrator Programs  
FACSys 5.0 has:  
   Two Licensing Models:  
·Client Model - which provides for unlimited Channels on a single server  
·Channel Model - which provides for unlimited names users across all Servers in one server farm  
·Additional Licenses may be required for:  
· HPCL-PS rendering engine, licenses for SAP Systems, and embedded code programs using HPCL files  
· Out-Side IN(TM)  
· SAP Gateway License and Comserver for SAP systems.  
·All other Gateway licenses for e-Mail Gateways and Multi-function peripherals are included in FACSys 5.0 Enterprise     

As such, the pre-5.0 FACSys Administrator programs can not communicate with a FACSys 5.0 Servers and 5.0 Administrator programs cannot communicate with 4.9 Servers or pre-4.9 Servers.

·Client Desktop Programs  
·FACSys 4.9 Client Desktop WILL NOT work with a FACSys 5.0 Server.  

·Server to Server Routing  
·Client to Client servers - YES  
·Channel to Channel Servers - YES  
·Channel to Client Servers - NO  
·Client to Channel Servers - NO