-.IP "\fBtcp:\fIip\fB:\fIport\fR"
-Connect to the given TCP \fIport\fR on \fIip\fR.
-.IP "\fBunix:\fIfile\fR"
-Connect to the Unix domain server socket named \fIfile\fR.
-.IP "\fBptcp:\fIport\fR[\fB:\fIip\fR]"
-Listen on the given TCP \fIport\fR for a connection. By default,
-\fB\*(PN\fR listens for connections to any local IP address, but
-\fIip\fR may be specified to listen only for connections to the given
-\fIip\fR.
-.IP "\fBpunix:\fIfile\fR"
-Listen on the Unix domain server socket named \fIfile\fR for a
-connection.