How to prevent a new window to get the window manager focus

[Joaquín Cuenca Abela <cuenca pacaterie u-psud fr>]

cf. subject.

I have a program that creates a new window, but I want to prevent the
window manager from focusing the new created window.

Anybody knows how to do that without running in race conditions, and
being wm independent?

Btw, yes, I have a good reason.  That's not a "keep consistency with
other apps and let the wm decide" kind of question.

Cheers,

-- 
Joaquín Cuenca Abela
cuenca pacaterie u-psud fr