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Vessels operating away from the dock between sunset and sunrise must have navigation lights, sound-producing devices (such as a whistle or horn), and radar or radio equipment for communication and navigation. These devices help ensure the safety of the vessel and others in low-visibility conditions.
virtual devices in os
A whistle or bell, AND a horn audible for at least 1 mile.
types of devices in operating system
Drivers are written for many operating systems.
The device drivers allow the operating system to communicate with peripheral devices.
Personal floatation devices are required while operating a motorboat in Virginia.
Personal floatation devices are required while operating a motorboat in Virginia.
Operating system
The combination of dedicated devices and shared devices those devices are called as vertual devices.
Most output devices are universal to various operating systems. Such as, your television or maybe even your stereo. Universal operating system can also be referred as a remote.
when several processes can use a device at the same time then those devices are termed as shared devices.