yesterday

(  how to inhibit messages in message area
    how to inhibit messages in message area: SOLVED
)
 i thought the problem of  inhibiting the popping up of the initial frame
after it's been made invisible to be solved by redefining the function 
"message"
as doing nothing

but that only sometimes workes.

What I intend:

 prep.el started by shellscrip "prep"

#!/bin/bash
emacs -l $HOME/Documents/StammDt/prep.el $HOME/Documents/StammDt/StmDt

should, finally, show ONLY the frame created with

(setq nf (make-frame '( (minibuffer . nil)
                        (height     . 13)
                        (width      . 59)
)        )            )

and not the initial frame as well.
So
how can prep.el test if there are still
some messages to be displayed
( that would make the initial frame
  visible again even after e.g. "make-frame-invisible"
)
to wait with making invisible until no more
messages are comming?