In computing, a system call is the programmatic way in which a computer program requests a service from the kernel of the operating system it is executed on. This may include hardware-related services (for example, accessing a hard disk drive), creation and execution of new processes, and communication with integral kernel services such as process scheduling. System calls provide an essential interface between a process and the operating system.
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Receiver / Display HappyCall HC-2300R
The receiving device of the wireless call system.
0,00$ -
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Wooden Stand Happy Call HC-140
Stylish wooden stand for call buttons Happy Call
9,00$ -
Call Button Happy Call HC-1000T
Wireless button. It has an original design and three colors. On the reverse side of the button is Velcro for fixing.
22,00$ -
Call Button HC-104T Happy Call
Wireless button. It has an original design and three colors. On the reverse side of the button is Velcro for fixing.
22,00$ -
Call Button HC-108T Happy Call
Wireless button. It has an original design and three colors. On the reverse side of the button is Velcro for fixing.
22,00$ -
Call Button Happy Call HC-1800T
Wireless button. It has an original design and three colors. On the reverse side of the button is Velcro for fixing.22,00$ -
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Call Button HC-110T Happy Call
Wireless button. It has an original design and three color solutions. On the reverse side of the button there is a Velcro for fixation.
23,00$