ENQ: /enkw/ Or /enk/ [from The ASCII Mnemonic ENQuire For 0000101] An On-line Convention For Querying Someone's Availability.

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: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}.
-- The AI Hackers Dictionary