"Ocrenger" is a user-only application developed by Corp. Pascal that serves as a contact network system. It can be used for safety confirmation during disasters and emergencies, as well as for communication through a bulletin board during normal times. Various organizations such as companies, schools, hospitals, and local governments are utilizing this application. To register for the application, users need to follow a simple process. They need to launch the app, select "Account" from the bottom of the icon, and then select the upper right (+) button in the account section. Finally, they need to enter the ID and authentication key provided by their affiliation. The application offers several features and benefits. It has an intuitive and convenient interface, making it easy to operate. Users do not need to provide personal information such as email addresses. They can reply to emergency situations and communicate their safety status. The application is designed to be robust during disasters, with servers set up both domestically and internationally. It also automatically delivers earthquake and weather information. Additionally, users can interact with each other through a bulletin board feature. Please note that while the application is free to install, it requires a contract with Corp. Pascal's "Ocrenger" service. For more information, please refer to the product's homepage.