openbios/Documentation/kernel/initializers.txt

Initializers are called when the forth kernel is started, to do some
initialization stuff. 
Pro: If code needs initialization you can keep this in place with the code
and don't need to patch the kernel itself to do so.

There are 2 types of initializers. "Normal" and "Late" initializers.

Since initializers are only called during startup, they don't need a name.

Definition:
  initializer      ( xt -- )
  late-initializer ( xt -- )

Examples:
  :noname <definition> ; initializer

  :noname
     some-base initializations
  ; late-initializer
 
Late initializers are run after all ordinary initializers have
been executed.