+.SH CLR_REPORT STRINGS
+This sequence allows for clearing previously set \fBREPORT\fR strings.
+\fBREPORT\fR strings are kept in an array of a pre-determined size (at
+compilation time); \fBCLR_REPORT\fR will reclaim the space for cleared
+entries so that new strings can use that space.
+.SH ECHO
+The echo options controls whether the output from the modem is echoed
+to \fIstderr\fR. This option may be set with the \fI\-e\fR option, but
+it can also be controlled by the \fIECHO\fR keyword. The "expect\-send"
+pair \fIECHO\fR \fION\fR enables echoing, and \fIECHO\fR \fIOFF\fR
+disables it. With this keyword you can select which parts of the
+conversation should be visible. For instance, with the following
+script:
+.IP
+ABORT 'BUSY'
+.br
+ABORT 'NO CARRIER'
+.br
+\&'' ATZ
+.br
+OK\er\en ATD1234567
+.br
+\er\en \ec
+.br
+ECHO ON
+.br
+CONNECT \ec
+.br
+ogin: account
+.LP
+all output resulting from modem configuration and dialing is not visible,
+but starting with the \fICONNECT\fR (or \fIBUSY\fR) message, everything
+will be echoed.
+.SH HANGUP
+The HANGUP options control whether a modem hangup should be considered
+as an error or not. This option is useful in scripts for dialling
+systems which will hang up and call your system back. The HANGUP
+options can be \fBON\fR or \fBOFF\fR.
+.br
+When HANGUP is set OFF and the modem hangs up (e.g., after the first
+stage of logging in to a callback system), \fBchat\fR will continue
+running the script (e.g., waiting for the incoming call and second
+stage login prompt). As soon as the incoming call is connected, you
+should use the \fBHANGUP ON\fR directive to reinstall normal hang up
+signal behavior. Here is an (simple) example script:
+.IP
+ABORT 'BUSY'
+.br
+\&'' ATZ
+.br
+OK\er\en ATD1234567
+.br
+\er\en \ec
+.br
+CONNECT \ec
+.br
+\&'Callback login:' call_back_ID
+.br
+HANGUP OFF
+.br
+ABORT "Bad Login"
+.br
+\&'Callback Password:' Call_back_password
+.br
+TIMEOUT 120
+.br
+CONNECT \ec
+.br
+HANGUP ON
+.br
+ABORT "NO CARRIER"
+.br
+ogin:\-\-BREAK\-\-ogin: real_account
+.br
+\fIetc ...\fR
+.LP