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+SYNOPSIS
+        int attach_erq_demon(object ob, int do_close)
+        int attach_erq_demon(string obname, int do_close)
+
+DESCRIPTION
+        This privileged efun is to set/change the connection of the
+        driver to the external erq demon, thus in effect changing the
+        demons.
+
+        The connection of the given interactive 'ob'ject is taken away(!)
+        from it and stored as the erq-connection. The object itself is
+        then no longer needed, but may stay alive - it is just another
+        non-interactive object then.
+
+        In the second form, the string will be combined as suffix to
+        the filename ERQFILE<obname>, which is then the binary to be
+        forked off as new erq demon. The communication with this erq
+        will take place over unix domain sockets. ERQFILE defaults to
+    BINDIR/erq, where BINDIR is the configuration value for the
+    executable directory.
+
+        If there is alreay an erq demon connected to the driver, the
+        function will fail unless 'do_close' (default 0) is specified
+        as 1 (or any other odd integer): then the old connection will
+        be closed before attaching the new.
+        The efun returns 1 on success, else 0.
+
+EXAMPLE
+        To restart the (default) erq, write in
+        master.c::stale_erq(closure c):
+          attach_erq_demon("", 0);
+
+HISTORY
+        Introduced in 3.2.1@61.
+
+SEE ALSO
+        send_erq(E), erq(C)