as a leading C<;> or perhaps a C<+>, or by wrapping it with parentheses
or braces.
+=head2 Calling the debugger
+
+There are several ways to call the debugger:
+
+=over 4
+
+=item perl -d program_name
+
+On the given program identified by C<program_name>.
+
+=item perl -d -e 0
+
+Interactively supply an arbitrary C<expression> using C<-e>.
+
+=item perl -d:Ptkdb program_name
+
+Debug a given program via the C<Devel::Ptkdb> GUI.
+
+=item perl -dt threaded_program_name
+
+Debug a given program using threads (experimental).
+
+=back
+
=head2 Debugger Commands
-The debugger understands the following commands:
+The interactive debugger understands the following commands:
=over 12