FVWM: can xcompmgr work in fvwm config?

[for.register for.register]

I used to  xcompmgr in fluxbox, since I can set different alpha value
in ~/.fluxbox/init for different transparency. For focus window,
transparency can be set to 1%, mean while unfocus windown can set to
90%. My question is can I do the same thing in fvwm under xcompmgr?

Thanks for any advice.

Walter