TRON is a real-time OS that has been developed and developed by TRON Project since 1984. There are several types of TRON, including ITRON for embedded devices and BTRON for PC and PDA. ITRON is embedded in devices such as mobile phones, automatic engine controls, and video cameras. As a BTRON-specification OS that runs on a PC, an OS that can handle more characters (hundreds of thousands of characters compared to thousands of JIS characters) has been created.

 MacOS is Apple’s OS, which mainly runs on Apple’s PC hardware. There are several versions of the Mac OS, but the latest version is a single-user, multitasking OS based on UNIX. The main feature of Mac OS is the user interface by GUI like Windows. The operation usually uses a mouse with a single button. Mac OS has detailed guidelines for application interfaces, so operations are often similar even if the applications differ. In addition to daily use, Mac OS is used in fields such as music production, graphic production, and publishing.