is#user_interface
  supertype:  #user_interface__interface  (computer science) a program that controls a display for the user (usually on a computer monitor) and that allows the user to interact with the system
  subtype:  is#non-graphical_user_interface
     subtype:  is#procedure_call_interface
        subtype:  is#network-accessible_procedure_call_interface
           subtype:  is#RPC_interface__Remote_Procedure_Call_interface__remoteprocedurecallinterface
        subtype:  is#API__application_programming_interface__applicationprogramminginterface
     subtype:  is#command_based_interface__commandbasedinterface
        subtype:  is#network-accessible_command_based_interface
           subtype:  is#OKBC_interface
           subtype:  is#CGI-accessible_command_based_interface
        subtype:  is#direct_command_based_interface__shell
           subtype:  is#sh
           subtype:  is#ksh
           subtype:  is#csh
  subtype:  is#graphical_user_interface
  subtype:  is#network-accessible_interface
     subtype:  is#Web_based_interface
        subtype:  is#HTML_based_interface
        subtype:  is#CGI_based_interface
     subtype:  is#network-accessible_procedure_call_interface
     subtype:  is#network-accessible_command_based_interface

No statement uses or specializes is#user_interface; click here to add one.