Installation guide

9 Clears baud rate bits and sets them to 2400.
10 Sets the line attributes.
11 This write call, containing the login message, blocks until someone
dials in on the modem and all the signals are present.
12 Gets the user’s login name.
13 Executes the login program, if the login name is valid.
D–4 Differences Between DIGITAL UNIX and ULTRIX Terminal Modem Control