FVWM: meaning of '+ I', '+ M', '+ D'?

hw <[email protected]> Fri, 02 Aug 2019 00:35:09 +0200

Newsgroups	gmane.comp.window-managers.fvwm
Organization	my virtual residence
Message-ID	<[email protected]>

Hi,

what is the meaning of '+ I', '+ M', '+ D' when adding stuff to
functions or menues?  That doesn't seem to be explained in the man page
...

Why does '+ I' work and '+I' doesn't?

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