System parameter in catalog tcpip node What is the purpose of the "system" parameter when cataloging tcpip nodes?

&gt;&gt;-CATALOG--+-------+--+-TCPIP NODE--+--nodename----------------&gt;
            '-ADMIN-'  +-TCPIP4 NODE-+             
                       '-TCPIP6 NODE-'             

&gt;--REMOTE--+-hostname-----+--SERVER--+-service-name-+-----------&gt;
           +-IPv4 address-+          '-port number--'   
           '-IPv6 address-'                             

&gt;--+----------------+--+--------------------------------+-------&gt;
   +-SECURITY SOCKS-+  '-REMOTE_INSTANCE--instance-name-'   
   '-SECURITY SSL---'                                       

&gt;--+---------------------+--+-------------------------------+---&gt;
   '-SYSTEM--system-name-'  '-OSTYPE--operating-system-type-'   

&gt;--+------------------------+----------------------------------&gt;&lt;
   '-WITH--"comment-string"-'   


What is the difference with "hostname"? I always ignore this value, but I want to know its purpose. Is it just informative? where can I see the effect of including or ignoring it?
I think it gives you an opportunity to supply a human-friendly name for the system if its hostname is not defined or is not informative, such as d33a891p.z30b.l8.mycompany.com