This is the problem. Also for twm one needs to learn and discover it by carefully reading the man pages.In another Window Manager, it took me a few months to stumble on the answer to some of this.
This is the reason because I do not use cwm, I never found the time to learn it. Also the reason because
I do not use fvwm in FreeBSD: it is not nicely configured like in OpenBSD and I do not know how to
configure it. But fvwm is too big.
jwm seems not to have a big screen like vtwm or fvwm, but 4 (or more?) independent desktops. Perhaps
it is like cwm with its grouped windows? It is a different principle.