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Any program can be an executable, and it can be named anything the user chooses, and would still function exactly the same.
PC games are often run via an executable. If you rename that executable to something else, it will still function perfectly fine.
Therefore, one character long executable programs are just executable programs that have been renamed one character long, and will function as intended.
It sounds like you are looking for a network. If a node can not find a network to connect to, then it cannot connect.
Answer:
A HUB
Explanation:
A hub can described as an hardware or network device use for multi purpose functions like connecting series of internet devices together there by making it possible for all devices to work or function together on a single network.
Hubs are classified into active hub, passive hub, and intelligent hub.
ACTIVE HUB: This type of hub boost the signals but can not perform calculations.
PASSIVE HUB: this type only send the signals but can not boost a signal.
INTELLIGENT HUB: it brings about the boosting of signals and also bring about packets to be analyzed.
