DuckCorp

DuckCorp Dico

(RFC 2229 compliant dictionary server)
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Found one definition 

  1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                

    
                
                  
    SMG
    

       Screen Management Guidelines.  A VMS package of run-time
   library routines providing windows on DEC VT100 terminals.