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to send error messages to send control messages
There are many alphabet systems used to send messages throughout history. The most relevant and recent one would be known as Morse code. Any language's alphabet can be used to send messages as well.
They can be used to add up numbers, send spreadsheets, and to send messages
the first method used to send messages by electricity.
People used the Morse Code to send messages from far distances Morse code was used by how long you hold it down.
software used to send, receive, forward, store, print and delete messages
Before the telephone, telegraphs were used.
Committees of Correspondence
Receptor proteins are used to pass messages between cells. They send the messages from outside of the cell to the inside of the cell.
TCP/IP networking protocol is used when communicate through the internet
It depends on how "mail" is defined. Doves are still used to send messages.
It means that she is ignoring you now. She has lost interest in you or found someone else than you.