Make Application a role

S28-special-names.pod

@@ -134,10 +134,10 @@ scope may also declare a local meaning of C<$*OUT> that applies only
 to called code.  Likewise each thread could log its own errors
 to its own C<$*ERR>, since a thread is a dynamic scope.
 
-The class C<Application> collects a few common features of some of the special
+The C<Application> role collects a few common features of some of the special
 variables such as C<$*PERL>, C<$?VM>, C<$*KERNEL>, etc.
 
- class Application {
+ role Application {
      has Str $.name;
      has Str $.auth;
      has Version $.version;
@@ -220,6 +220,12 @@ If a column has a "-" in it, it means that item is unavailable in that version o
  $SIG{__DIE__}       $*ON_DIE
  ${^OPEN}            -              This was internal; forget it
 
+=head2 SPECIAL VARIABLES MORE IN DEPTH
+
+=head3 $?KERNEL / $*KERNEL
+
+=head3 $?VM / $*VM
+
 =head2 NOT YET DEFINED
 
 The following items are not yet defined, but will need to be defined.