FAQ 19.2 toggle set option ?

I read:

http://vimdoc.sourceforge.net/cgi-bin/vimfaq2html3.pl#19.2

and

:help set-option

I don't understand how this:

:se[t] {option}! or
:se[t] inv{option}

works

I want to be able to use one <F> key to toggle between :set wrap and :set nowrap

I don't know how to do this but it appears that it can be done.

--
If we can but prevent the government from wasting the labours of the
people, under the pretence of taking care of them, they must become
happy. - Thomas Jefferson

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