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On any connection,
any unflushed incoming lines that begin with the out-of-band prefix will be treated as out-of-band commands,
meaning that if the verb
$do_out_of_band_command() exists and is executable,
it will be called for each such line.
For more on this, see Out-of-band Processing.
As we previously described in The Built-in Command Parser, on any logged-in connection that
.programcommand in progress, and
.programor one of the other four intrinsic commands
$do_command()provided that verb exists and is executable. If this verb suspends or returns a true value, then processing of that line ends at this point, otherwise, whether the verb returned false or did not exist in the first place, the remainder of the builtin parsing process is invoked.