I found a trial that serves perfectly well, just because goes to one of my screens without any configuration.
can you explain what you mean by:
it "goes to one of my screens without any configuration"
I have six screens or monitors.
1 2 3
4 5 6
The main one is the number 5 (center-down)
affirmator present the window in the monitor 4 (left-down) in the right upper side
PUW present the message where i configure in the monitor 5
I am trying now the completely free Subliminal Messages 1.1.8 www.mindofwinner.com
this last one seems to appear in all screens.