Remember ENQ
ENQ Technical Terms
ENQ: /enkw/ or /enk/ [from the ASCII mnemonic ENQuire for 0000101] An on-line convention for querying someone's availability. After opening a {talk mode} connection to someone apparently in heavy hack mode, one might type `SYN SYN ENQ?' (the SYNs representing notional synchronization bytes), and expect a return of {ACK} or {NAK} depending on whether or not the person felt interruptible. Compare {ping}, {finger}, and the usage of `FOO?' listed under {talk mode}.