Such a line is said to work in duplex mode. Many technologies allow sending and receiving simultaneously.
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how does computer send data through serial port?
Computers_send_and_receive_data_in_the_form_of_signals
Client-server systems facilitate communication and data exchange by allowing clients to send requests for information or services to servers, which then process these requests and send back the requested data or perform the requested actions. This communication is typically done over a network using protocols such as HTTP or TCP/IP. The client-server architecture enables multiple clients to connect to a server simultaneously, allowing for efficient sharing of resources and centralized management of data.