The first one let you know if you are at the 'loading' stage while emacs is
starting. It could be useful in case when you start emacs --daemon from
startup script and your elisp code intended to ask yes-or-no -- then emacs
--daemon will stuck, but if you have some function like `loadingp' then you
can defer some questions on after-make-frame-functions for example.

Like:
(if (and (daemonp) (loadingp))
  (add-hook 'after-make-frame-functions ask-my-question)
 (ask-my-question))

This could be achieved by setting variable like `emacs-loading' to `t' in
the beginning of .emacs and setting it to `nil' in the end. But I think
there must be standard way for this.


Second I want some standard way to filter out emacs daemon's
'frame'(usually it's frame with ('name . "F1") parameter) from
`(frame-list)'.