Newbie......Linux start up and window manager

How can I configure so that a desired window manager is loaded when the system start up? Currently, I have FVWM and AfterStep reside in my system and  everytime I type "startx", AfterStep will be executed . How can I configure as the default window manager to be FVWM but not AfterStep? Pls advise me as where to seek resources regarding FVWM or AfterStep. I've found some but not so useful. Thanks.
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There is a file: /etc/X11/xinit/Xclients
You should change lines connected to PREFERRED. Probably you have first lines AfterStep, than FVWM. You should change them places.
After this changes, PREFERRED will be FVWM.
Than you should change places of lines, in which you can read something like that:
in which $... exec `which $...`
Probably here also first is AnotherStep, Second is FVWM.
These changes should help you.

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Sometimes you can do these changes in file $HOME/.Xclients  (if you have such file).
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