-The machine interface (MI) mode converts the traditional pretty-printing
-to a machine output syntax. The MI mode provides a change-resistant way
-to access information generated by the `lttng` command-line program.
+In that case, you must use the option:--group='GROUP' option, with
+the same 'GROUP' argument, of the `lttng` tool.
+
+Without the nloption:--group option of the root session daemon::
+ `tracing`
+
+LTTng-instrumented user applications automatically register to both the
+root and user session daemons. This makes it possible for both session
+daemons to list the available instrumented applications and their
+instrumentation points (see man:lttng-list(1)).
+
+
+OPTIONS
+-------
+option:-g 'GROUP', option:--group='GROUP'::
+ Set the name of the Unix tracing group to 'GROUP' instead of
+ `tracing`.
++
+You must use this option to be able to connect to a root session daemon
+(man:lttng-sessiond(8)) which was started with its own
+nloption:--group='GROUP' option.
+
+option:-m `xml`, option:--mi=++xml++::
+ Print the command's result using a stable XML machine interface (MI)
+ output instead of the default, unstable human-readable output.