#operating_system__operatingsystem__OS  (computer science) software that controls the execution of computer programs and may provide various services
  supertype:  software__software_system__software_package__package  (computer science) written programs or procedures or rules and associated documentation pertaining to the operation of a computer system and that are stored in read/write memory; "the market for software is expected to expand"
  subtype:  DOS  UNIX
  part of:  platform.computer_system
  part:  supervisory_program__supervisoryprogram__supervisor__executive_program__executiveprogram  a program that controls the execution of other programs
     part:  supervisory_routine__supervisoryroutine__executive_routine__executiveroutine  a routine that coordinates the operation of subroutines

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